25729252957 has 4 divisors (see below), whose sum is σ = 25729580380. Its totient is φ = 25728925536.

The previous prime is 25729252949. The next prime is 25729252999. The reversal of 25729252957 is 75925292752.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 24932094201 + 797158756 = 157899^2 + 28234^2 .

It is a 3-Lehmer number, since φ(25729252957) divides (25729252957-1)³.

It is a cyclic number.

It is not a de Polignac number, because 25729252957 - 2³ = 25729252949 is a prime.

It is a deceptive number, since it divides R_25729252956.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25729252898 and 25729252907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25729252907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32743 + ... + 229195.

It is an arithmetic number, because the mean of its divisors is an integer number (6432395095).

It is a Poulet number, since it divides 2^25729252956-1.

Almost surely, 2^25729252957 is an apocalyptic number.

25729252957 is the 130969-th pentagonal number.

It is an amenable number.

25729252957 is a deficient number, since it is larger than the sum of its proper divisors (327423).

25729252957 is a wasteful number, since it uses less digits than its factorization.

25729252957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327422.

The product of its digits is 7938000, while the sum is 55.

It can be divided in two parts, 257292 and 52957, that added together give a square (310249 = 557²).

The spelling of 25729252957 in words is "twenty-five billion, seven hundred twenty-nine million, two hundred fifty-two thousand, nine hundred fifty-seven".