25425021064 has 16 divisors (see below), whose sum is σ = 48453422220. Its totient is φ = 12504108480.

The previous prime is 25425021053. The next prime is 25425021071. The reversal of 25425021064 is 46012052452.

It can be written as a sum of positive squares in 2 ways, for example, as 22427458564 + 2997562500 = 149758^2 + 54750^2 .

It is a super-2 number, since 2×25425021064² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26049739 + ... + 26050714.

Almost surely, 2^25425021064 is an apocalyptic number.

It is an amenable number.

25425021064 is a deficient number, since it is larger than the sum of its proper divisors (23028401156).

25425021064 is a wasteful number, since it uses less digits than its factorization.

25425021064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52100520 (or 52100516 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

The spelling of 25425021064 in words is "twenty-five billion, four hundred twenty-five million, twenty-one thousand, sixty-four".