78561667011728 has 20 divisors (see below), whose sum is σ = 152215435825200. Its totient is φ = 39280264218144.

The previous prime is 78561667011691. The next prime is 78561667011823. The reversal of 78561667011728 is 82711076616587.

It is a super-2 number, since 2×78561667011728² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34440878 + ... + 36651021.

It is an arithmetic number, because the mean of its divisors is an integer number (7610771791260).

Almost surely, 2^{78561667011728} is an apocalyptic number.

It is an amenable number.

78561667011728 is a deficient number, since it is larger than the sum of its proper divisors (73653768813472).

78561667011728 is a wasteful number, since it uses less digits than its factorization.

78561667011728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71160974 (or 71160968 counting only the distinct ones).

The product of its (nonzero) digits is 47416320, while the sum is 65.

The spelling of 78561667011728 in words is "seventy-eight trillion, five hundred sixty-one billion, six hundred sixty-seven million, eleven thousand, seven hundred twenty-eight".