65947947816 has 64 divisors (see below), whose sum is σ = 179286194880. Its totient is φ = 20130370560.

The previous prime is 65947947757. The next prime is 65947947823. The reversal of 65947947816 is 61874974956.

It is a super-2 number, since 2×65947947816² (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 15 ways as a sum of consecutive naturals, for example, 2169190 + ... + 2199381.

It is an arithmetic number, because the mean of its divisors is an integer number (2801346795).

Almost surely, 2^65947947816 is an apocalyptic number.

It is an amenable number.

65947947816 is an abundant number, since it is smaller than the sum of its proper divisors (113338247064).

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

65947947816 is a wasteful number, since it uses less digits than its factorization.

65947947816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4368634 (or 4368630 counting only the distinct ones).

The product of its digits is 91445760, while the sum is 66.

The spelling of 65947947816 in words is "sixty-five billion, nine hundred forty-seven million, nine hundred forty-seven thousand, eight hundred sixteen".