25955787664 has 15 divisors (see below), whose sum is σ = 50290587217. Its totient is φ = 12977571616.

The previous prime is 25955787617. The next prime is 25955787677. The reversal of 25955787664 is 46678755952.

The square root of 25955787664 is 161108.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 24242490000 + 1713297664 = 155700^2 + 41392^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25955787596 and 25955787605.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 624294 + ... + 664570.

Almost surely, 2^25955787664 is an apocalyptic number.

25955787664 is the 161108-th square number.

It is an amenable number.

25955787664 is a deficient number, since it is larger than the sum of its proper divisors (24334799553).

25955787664 is an frugal number, since it uses more digits than its factorization.

25955787664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80562 (or 40279 counting only the distinct ones).

The product of its digits is 127008000, while the sum is 64.

Multiplying 25955787664 by its sum of digits (64), we get a square (1661170410496 = 1288864²).

The spelling of 25955787664 in words is "twenty-five billion, nine hundred fifty-five million, seven hundred eighty-seven thousand, six hundred sixty-four".