640132525 has 6 divisors (see below), whose sum is σ = 793764362. Its totient is φ = 512106000.

The previous prime is 640132517. The next prime is 640132531. The reversal of 640132525 is 525231046.

It can be written as a sum of positive squares in 3 ways, for example, as 123343236 + 516789289 = 11106^2 + 22733^2 .

It is not a de Polignac number, because 640132525 - 2³ = 640132517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640132493 and 640132502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12802626 + ... + 12802675.

Almost surely, 2^640132525 is an apocalyptic number.

It is an amenable number.

640132525 is a deficient number, since it is larger than the sum of its proper divisors (153631837).

640132525 is a wasteful number, since it uses less digits than its factorization.

640132525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25605311 (or 25605306 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 640132525 is about 25300.8404010618. The cubic root of 640132525 is about 861.8333545028.

The spelling of 640132525 in words is "six hundred forty million, one hundred thirty-two thousand, five hundred twenty-five".