25520653608 has 32 divisors (see below), whose sum is σ = 64421073600. Its totient is φ = 8424292608.

The previous prime is 25520653607. The next prime is 25520653619. The reversal of 25520653608 is 80635602552.

It is a self number, because there is not a number n which added to its sum of digits gives 25520653608.

It is not an unprimeable number, because it can be changed into a prime (25520653607) 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, 5159473 + ... + 5164416.

It is an arithmetic number, because the mean of its divisors is an integer number (2013158550).

Almost surely, 2^25520653608 is an apocalyptic number.

It is an amenable number.

25520653608 is an abundant number, since it is smaller than the sum of its proper divisors (38900419992).

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

25520653608 is a wasteful number, since it uses less digits than its factorization.

25520653608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10324001 (or 10323997 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 42.

The spelling of 25520653608 in words is "twenty-five billion, five hundred twenty million, six hundred fifty-three thousand, six hundred eight".