51665432580 has 48 divisors (see below), whose sum is σ = 160736903040. Its totient is φ = 13777448544.

The previous prime is 51665432569. The next prime is 51665432617. The reversal of 51665432580 is 8523456615.

51665432580 is a `hidden beast` number, since 5 + 1 + 6 + 6 + 543 + 25 + 80 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47837824 + ... + 47838903.

It is an arithmetic number, because the mean of its divisors is an integer number (3348685480).

Almost surely, 2^51665432580 is an apocalyptic number.

It is an amenable number.

51665432580 is an abundant number, since it is smaller than the sum of its proper divisors (109071470460).

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

51665432580 is a wasteful number, since it uses less digits than its factorization.

51665432580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95676745 (or 95676737 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

The spelling of 51665432580 in words is "fifty-one billion, six hundred sixty-five million, four hundred thirty-two thousand, five hundred eighty".