51534512820 has 192 divisors, whose sum is σ = 192877977600. Its totient is φ = 11159337600.

The previous prime is 51534512803. The next prime is 51534512837. The reversal of 51534512820 is 2821543515.

51534512820 is a `hidden beast` number, since 51 + 534 + 51 + 2 + 8 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (51534512803) and next prime (51534512837).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 286956 + ... + 430595.

It is an arithmetic number, because the mean of its divisors is an integer number (1004572800).

Almost surely, 2^51534512820 is an apocalyptic number.

It is an amenable number.

51534512820 is an abundant number, since it is smaller than the sum of its proper divisors (141343464780).

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

51534512820 is a wasteful number, since it uses less digits than its factorization.

51534512820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717595 (or 717587 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The spelling of 51534512820 in words is "fifty-one billion, five hundred thirty-four million, five hundred twelve thousand, eight hundred twenty".