51145697820868 has 48 divisors (see below), whose sum is σ = 107380798156800. Its totient is φ = 20852967457440.

The previous prime is 51145697820823. The next prime is 51145697820883. The reversal of 51145697820868 is 86802879654115.

It is a junction number, because it is equal to n+sod(n) for n = 51145697820797 and 51145697820806.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 499301458 + ... + 499403881.

It is an arithmetic number, because the mean of its divisors is an integer number (2237099961600).

Almost surely, 2^{51145697820868} is an apocalyptic number.

It is an amenable number.

51145697820868 is an abundant number, since it is smaller than the sum of its proper divisors (56235100335932).

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

51145697820868 is a wasteful number, since it uses less digits than its factorization.

51145697820868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998705440 (or 998705438 counting only the distinct ones).

The product of its (nonzero) digits is 232243200, while the sum is 70.

The spelling of 51145697820868 in words is "fifty-one trillion, one hundred forty-five billion, six hundred ninety-seven million, eight hundred twenty thousand, eight hundred sixty-eight".