51018587640 has 64 divisors (see below), whose sum is σ = 170061962400. Its totient is φ = 13604956416.

The previous prime is 51018587623. The next prime is 51018587651. The reversal of 51018587640 is 4678581015.

51018587640 is a `hidden beast` number, since 5 + 1 + 0 + 1 + 8 + 587 + 64 + 0 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23618637 + ... + 23620796.

Almost surely, 2^51018587640 is an apocalyptic number.

It is an amenable number.

51018587640 is an abundant number, since it is smaller than the sum of its proper divisors (119043374760).

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

51018587640 is a wasteful number, since it uses less digits than its factorization.

51018587640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47239453 (or 47239443 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 45.

The spelling of 51018587640 in words is "fifty-one billion, eighteen million, five hundred eighty-seven thousand, six hundred forty".