51650257864 has 32 divisors (see below), whose sum is σ = 98799183000. Its totient is φ = 25308946432.

The previous prime is 51650257859. The next prime is 51650257873. The reversal of 51650257864 is 46875205615.

It can be written as a sum of positive squares in 4 ways, for example, as 31531104900 + 20119152964 = 177570^2 + 141842^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240529 + ... + 401440.

Almost surely, 2^51650257864 is an apocalyptic number.

It is an amenable number.

51650257864 is a deficient number, since it is larger than the sum of its proper divisors (47148925136).

51650257864 is a wasteful number, since it uses less digits than its factorization.

51650257864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642177 (or 642173 counting only the distinct ones).

The product of its (nonzero) digits is 2016000, while the sum is 49.

The spelling of 51650257864 in words is "fifty-one billion, six hundred fifty million, two hundred fifty-seven thousand, eight hundred sixty-four".