25601440164 has 12 divisors (see below), whose sum is σ = 59736693744. Its totient is φ = 8533813384.

The previous prime is 25601440141. The next prime is 25601440187. The reversal of 25601440164 is 46104410652.

It is an interprime number because it is at equal distance from previous prime (25601440141) and next prime (25601440187).

It is a tau number, because it is divible by the number of its divisors (12).

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 3 ways as a sum of consecutive naturals, for example, 1066726662 + ... + 1066726685.

It is an arithmetic number, because the mean of its divisors is an integer number (4978057812).

Almost surely, 2^25601440164 is an apocalyptic number.

It is an amenable number.

25601440164 is an abundant number, since it is smaller than the sum of its proper divisors (34135253580).

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

25601440164 is a wasteful number, since it uses less digits than its factorization.

25601440164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2133453354 (or 2133453352 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The spelling of 25601440164 in words is "twenty-five billion, six hundred one million, four hundred forty thousand, one hundred sixty-four".