25344642164 has 12 divisors (see below), whose sum is σ = 45434907588. Its totient is φ = 12363240000.

The previous prime is 25344642163. The next prime is 25344642179. The reversal of 25344642164 is 46124644352.

It can be written as a sum of positive squares in 2 ways, for example, as 865536400 + 24479105764 = 29420^2 + 156458^2 .

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25344642163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77270087 + ... + 77270414.

It is an arithmetic number, because the mean of its divisors is an integer number (3786242299).

Almost surely, 2^25344642164 is an apocalyptic number.

It is an amenable number.

25344642164 is a deficient number, since it is larger than the sum of its proper divisors (20090265424).

25344642164 is a wasteful number, since it uses less digits than its factorization.

25344642164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154540546 (or 154540544 counting only the distinct ones).

The product of its digits is 552960, while the sum is 41.

The spelling of 25344642164 in words is "twenty-five billion, three hundred forty-four million, six hundred forty-two thousand, one hundred sixty-four".