25720750049 has 4 divisors (see below), whose sum is σ = 27233735364. Its totient is φ = 24207764736.

The previous prime is 25720750031. The next prime is 25720750061. The reversal of 25720750049 is 94005702752.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21391110049 + 4329640000 = 146257^2 + 65800^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25720750049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25720749988 and 25720750015.

It is not an unprimeable number, because it can be changed into a prime (25720750079) 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, 756492632 + ... + 756492665.

It is an arithmetic number, because the mean of its divisors is an integer number (6808433841).

Almost surely, 2^25720750049 is an apocalyptic number.

It is an amenable number.

25720750049 is a deficient number, since it is larger than the sum of its proper divisors (1512985315).

25720750049 is a wasteful number, since it uses less digits than its factorization.

25720750049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1512985314.

The product of its (nonzero) digits is 176400, while the sum is 41.

The spelling of 25720750049 in words is "twenty-five billion, seven hundred twenty million, seven hundred fifty thousand, forty-nine".