25760721768 has 32 divisors (see below), whose sum is σ = 65125425600. Its totient is φ = 8490424448.

The previous prime is 25760721743. The next prime is 25760721787. The reversal of 25760721768 is 86712706752.

It is a super-2 number, since 2×25760721768² (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 25760721768.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6027996 + ... + 6032267.

It is an arithmetic number, because the mean of its divisors is an integer number (2035169550).

Almost surely, 2^25760721768 is an apocalyptic number.

It is an amenable number.

25760721768 is an abundant number, since it is smaller than the sum of its proper divisors (39364703832).

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

25760721768 is a wasteful number, since it uses less digits than its factorization.

25760721768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12060361 (or 12060357 counting only the distinct ones).

The product of its (nonzero) digits is 1975680, while the sum is 51.

The spelling of 25760721768 in words is "twenty-five billion, seven hundred sixty million, seven hundred twenty-one thousand, seven hundred sixty-eight".