51595640820 has 72 divisors (see below), whose sum is σ = 162303339744. Its totient is φ = 13758836256.

The previous prime is 51595640819. The next prime is 51595640843. The reversal of 51595640820 is 2804659515.

51595640820 is a `hidden beast` number, since 5 + 1 + 5 + 9 + 564 + 0 + 82 + 0 = 666.

It is a super-2 number, since 2×51595640820² (a number of 22 digits) contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 5303334 + ... + 5313053.

It is an arithmetic number, because the mean of its divisors is an integer number (2254213052).

Almost surely, 2^51595640820 is an apocalyptic number.

It is an amenable number.

51595640820 is an abundant number, since it is smaller than the sum of its proper divisors (110707698924).

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

51595640820 is a wasteful number, since it uses less digits than its factorization.

51595640820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10616411 (or 10616397 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 45.

The spelling of 51595640820 in words is "fifty-one billion, five hundred ninety-five million, six hundred forty thousand, eight hundred twenty".