51318585990 has 160 divisors (see below), whose sum is σ = 166003326720. Its totient is φ = 11112572736.

The previous prime is 51318585959. The next prime is 51318586021. The reversal of 51318585990 is 9958581315.

It is a happy number.

51318585990 is a `hidden beast` number, since 51 + 3 + 1 + 8 + 585 + 9 + 9 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (51318585959) and next prime (51318586021).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 130452 + ... + 345911.

It is an arithmetic number, because the mean of its divisors is an integer number (1037520792).

Almost surely, 2^51318585990 is an apocalyptic number.

51318585990 is an abundant number, since it is smaller than the sum of its proper divisors (114684740730).

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

51318585990 is a wasteful number, since it uses less digits than its factorization.

51318585990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476408 (or 476399 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 54.

The spelling of 51318585990 in words is "fifty-one billion, three hundred eighteen million, five hundred eighty-five thousand, nine hundred ninety".