25641171660 has 96 divisors (see below), whose sum is σ = 77345049600. Its totient is φ = 6309464832.

The previous prime is 25641171653. The next prime is 25641171683. The reversal of 25641171660 is 6617114652.

It is a Harshad number since it is a multiple of its sum of digits (39).

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 31 ways as a sum of consecutive naturals, for example, 4133241 + ... + 4139439.

It is an arithmetic number, because the mean of its divisors is an integer number (805677600).

Almost surely, 2^25641171660 is an apocalyptic number.

25641171660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25641171660 is an abundant number, since it is smaller than the sum of its proper divisors (51703877940).

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

25641171660 is a wasteful number, since it uses less digits than its factorization.

25641171660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11527 (or 11525 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The spelling of 25641171660 in words is "twenty-five billion, six hundred forty-one million, one hundred seventy-one thousand, six hundred sixty".