51867567816 has 32 divisors (see below), whose sum is σ = 129722274240. Its totient is φ = 17282075328.

The previous prime is 51867567803. The next prime is 51867567847. The reversal of 51867567816 is 61876576815.

It is a happy number.

It is a super-2 number, since 2×51867567816² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51867567816.

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, 384916 + ... + 501891.

It is an arithmetic number, because the mean of its divisors is an integer number (4053821070).

Almost surely, 2^51867567816 is an apocalyptic number.

It is an amenable number.

51867567816 is an abundant number, since it is smaller than the sum of its proper divisors (77854706424).

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

51867567816 is a wasteful number, since it uses less digits than its factorization.

51867567816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889253 (or 889249 counting only the distinct ones).

The product of its digits is 16934400, while the sum is 60.

The spelling of 51867567816 in words is "fifty-one billion, eight hundred sixty-seven million, five hundred sixty-seven thousand, eight hundred sixteen".