25765721608 has 32 divisors (see below), whose sum is σ = 53138193120. Its totient is φ = 11711686800.

The previous prime is 25765721599. The next prime is 25765721629. The reversal of 25765721608 is 80612756752.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1199238 + ... + 1220533.

It is an arithmetic number, because the mean of its divisors is an integer number (1660568535).

Almost surely, 2^25765721608 is an apocalyptic number.

It is an amenable number.

25765721608 is an abundant number, since it is smaller than the sum of its proper divisors (27372471512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25765721608 is a wasteful number, since it uses less digits than its factorization.

25765721608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2419810 (or 2419784 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 49.

The spelling of 25765721608 in words is "twenty-five billion, seven hundred sixty-five million, seven hundred twenty-one thousand, six hundred eight".