216856405080 has 144 divisors (see below), whose sum is σ = 819850047120. Its totient is φ = 49567174272.

The previous prime is 216856405063. The next prime is 216856405141. The reversal of 216856405080 is 80504658612.

216856405080 is a `hidden beast` number, since 2 + 1 + 6 + 8 + 564 + 0 + 5 + 0 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6129084 + ... + 6164363.

It is an arithmetic number, because the mean of its divisors is an integer number (5693403105).

Almost surely, 2^216856405080 is an apocalyptic number.

216856405080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216856405080 is an abundant number, since it is smaller than the sum of its proper divisors (602993642040).

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

216856405080 is a wasteful number, since it uses less digits than its factorization.

216856405080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12293478 (or 12293464 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The spelling of 216856405080 in words is "two hundred sixteen billion, eight hundred fifty-six million, four hundred five thousand, eighty".