51994534560 has 48 divisors (see below), whose sum is σ = 163782785376. Its totient is φ = 13865209088.

The previous prime is 51994534541. The next prime is 51994534573. The reversal of 51994534560 is 6543549915.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×51994534560² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54160494 + ... + 54161453.

It is an arithmetic number, because the mean of its divisors is an integer number (3412141362).

Almost surely, 2^51994534560 is an apocalyptic number.

It is an amenable number.

51994534560 is an abundant number, since it is smaller than the sum of its proper divisors (111788250816).

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

51994534560 is a wasteful number, since it uses less digits than its factorization.

51994534560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108321965 (or 108321957 counting only the distinct ones).

The product of its (nonzero) digits is 2916000, while the sum is 51.

The spelling of 51994534560 in words is "fifty-one billion, nine hundred ninety-four million, five hundred thirty-four thousand, five hundred sixty".