25901640166 has 16 divisors (see below), whose sum is σ = 38989692000. Its totient is φ = 12905126208.

The previous prime is 25901640157. The next prime is 25901640227. The reversal of 25901640166 is 66104610952.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1111551 + ... + 1134613.

It is an arithmetic number, because the mean of its divisors is an integer number (2436855750).

Almost surely, 2^25901640166 is an apocalyptic number.

25901640166 is a deficient number, since it is larger than the sum of its proper divisors (13088051834).

25901640166 is a wasteful number, since it uses less digits than its factorization.

25901640166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25023.

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 25901640166 in words is "twenty-five billion, nine hundred one million, six hundred forty thousand, one hundred sixty-six".