51311055566440 has 32 divisors (see below), whose sum is σ = 117906255348480. Its totient is φ = 20087732391232.

The previous prime is 51311055566377. The next prime is 51311055566447. The reversal of 51311055566440 is 4466555011315.

It is not an unprimeable number, because it can be changed into a prime (51311055566447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13646555452 + ... + 13646559211.

It is an arithmetic number, because the mean of its divisors is an integer number (3684570479640).

Almost surely, 2^{51311055566440} is an apocalyptic number.

It is an amenable number.

51311055566440 is an abundant number, since it is smaller than the sum of its proper divisors (66595199782040).

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

51311055566440 is a wasteful number, since it uses less digits than its factorization.

51311055566440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27293114721 (or 27293114717 counting only the distinct ones).

The product of its (nonzero) digits is 1080000, while the sum is 46.

The spelling of 51311055566440 in words is "fifty-one trillion, three hundred eleven billion, fifty-five million, five hundred sixty-six thousand, four hundred forty".