25643656604 has 24 divisors (see below), whose sum is σ = 45162549600. Its totient is φ = 12740245056.

The previous prime is 25643656559. The next prime is 25643656607. The reversal of 25643656604 is 40665634652.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25643656607) 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, 581294 + ... + 623850.

It is an arithmetic number, because the mean of its divisors is an integer number (1881772900).

Almost surely, 2^25643656604 is an apocalyptic number.

It is an amenable number.

25643656604 is a deficient number, since it is larger than the sum of its proper divisors (19518892996).

25643656604 is a wasteful number, since it uses less digits than its factorization.

25643656604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43517 (or 43515 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 47.

The spelling of 25643656604 in words is "twenty-five billion, six hundred forty-three million, six hundred fifty-six thousand, six hundred four".