25649805652 has 6 divisors (see below), whose sum is σ = 44887159898. Its totient is φ = 12824902824.

The previous prime is 25649805631. The next prime is 25649805659. The reversal of 25649805652 is 25650894652.

It can be written as a sum of positive squares in only one way, i.e., 25537318416 + 112487236 = 159804^2 + 10606^2 .

It is a super-2 number, since 2×25649805652² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25649805652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25649805659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3206225703 + ... + 3206225710.

Almost surely, 2^25649805652 is an apocalyptic number.

It is an amenable number.

25649805652 is a deficient number, since it is larger than the sum of its proper divisors (19237354246).

25649805652 is a wasteful number, since it uses less digits than its factorization.

25649805652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6412451417 (or 6412451415 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 52.

The spelling of 25649805652 in words is "twenty-five billion, six hundred forty-nine million, eight hundred five thousand, six hundred fifty-two".