25772341657 has 8 divisors (see below), whose sum is σ = 26013417320. Its totient is φ = 25532375040.

The previous prime is 25772341643. The next prime is 25772341663. The reversal of 25772341657 is 75614327752.

It can be written as a sum of positive squares in 4 ways, for example, as 6144051456 + 19628290201 = 78384^2 + 140101^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25772341657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25772341657.

It is not an unprimeable number, because it can be changed into a prime (25772341607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230532 + ... + 323557.

It is an arithmetic number, because the mean of its divisors is an integer number (3251677165).

Almost surely, 2^25772341657 is an apocalyptic number.

It is an amenable number.

25772341657 is a deficient number, since it is larger than the sum of its proper divisors (241075663).

25772341657 is a wasteful number, since it uses less digits than its factorization.

25772341657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554523.

The product of its digits is 2469600, while the sum is 49.

The spelling of 25772341657 in words is "twenty-five billion, seven hundred seventy-two million, three hundred forty-one thousand, six hundred fifty-seven".