25170644052 has 30 divisors (see below), whose sum is σ = 65801036378. Its totient is φ = 8390214576.

The previous prime is 25170644011. The next prime is 25170644063. The reversal of 25170644052 is 25044607152.

It is a happy number.

25170644052 is a `hidden beast` number, since 2 + 5 + 1 + 7 + 0 + 644 + 0 + 5 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21584311056 + 3586332996 = 146916^2 + 59886^2 .

It is a super-2 number, since 2×25170644052² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 25170643998 and 25170644016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 38843263 + ... + 38843910.

Almost surely, 2^25170644052 is an apocalyptic number.

It is an amenable number.

25170644052 is an abundant number, since it is smaller than the sum of its proper divisors (40630392326).

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

25170644052 is a wasteful number, since it uses less digits than its factorization.

25170644052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77687189 (or 77687178 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 36.

The spelling of 25170644052 in words is "twenty-five billion, one hundred seventy million, six hundred forty-four thousand, fifty-two".