78856545812564 has 144 divisors (see below), whose sum is σ = 155306232990720. Its totient is φ = 34976307824640.

The previous prime is 78856545812557. The next prime is 78856545812567. The reversal of 78856545812564 is 46521854565887.

It is a junction number, because it is equal to n+sod(n) for n = 78856545812491 and 78856545812500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78856545812567) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5859883724 + ... + 5859897180.

It is an arithmetic number, because the mean of its divisors is an integer number (1078515506880).

Almost surely, 2^{78856545812564} is an apocalyptic number.

It is an amenable number.

78856545812564 is a deficient number, since it is larger than the sum of its proper divisors (76449687178156).

78856545812564 is a wasteful number, since it uses less digits than its factorization.

78856545812564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14890 (or 14875 counting only the distinct ones).

The product of its digits is 2580480000, while the sum is 74.

The spelling of 78856545812564 in words is "seventy-eight trillion, eight hundred fifty-six billion, five hundred forty-five million, eight hundred twelve thousand, five hundred sixty-four".