25163642646 has 12 divisors (see below), whose sum is σ = 54521225772. Its totient is φ = 8387880876.

The previous prime is 25163642629. The next prime is 25163642653. The reversal of 25163642646 is 64624636152.

It is a happy number.

25163642646 is a `hidden beast` number, since 2 + 5 + 1 + 636 + 4 + 2 + 6 + 4 + 6 = 666.

It is a super-2 number, since 2×25163642646² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 698990056 + ... + 698990091.

It is an arithmetic number, because the mean of its divisors is an integer number (4543435481).

Almost surely, 2^25163642646 is an apocalyptic number.

25163642646 is an abundant number, since it is smaller than the sum of its proper divisors (29357583126).

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

25163642646 is a wasteful number, since it uses less digits than its factorization.

25163642646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1397980155 (or 1397980152 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 45.

The spelling of 25163642646 in words is "twenty-five billion, one hundred sixty-three million, six hundred forty-two thousand, six hundred forty-six".