25320631636 has 6 divisors (see below), whose sum is σ = 44311105370. Its totient is φ = 12660315816.

The previous prime is 25320631627. The next prime is 25320631649. The reversal of 25320631636 is 63613602352.

It can be written as a sum of positive squares in only one way, i.e., 14607139600 + 10713492036 = 120860^2 + 103506^2 .

It is a super-2 number, since 2×25320631636² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25320631595 and 25320631604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3165078951 + ... + 3165078958.

Almost surely, 2^25320631636 is an apocalyptic number.

It is an amenable number.

25320631636 is a deficient number, since it is larger than the sum of its proper divisors (18990473734).

25320631636 is a wasteful number, since it uses less digits than its factorization.

25320631636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6330157913 (or 6330157911 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 37.

The spelling of 25320631636 in words is "twenty-five billion, three hundred twenty million, six hundred thirty-one thousand, six hundred thirty-six".