216742556862 has 128 divisors (see below), whose sum is σ = 523538104320. Its totient is φ = 66069561600.

The previous prime is 216742556857. The next prime is 216742556903. The reversal of 216742556862 is 268655247612.

216742556862 is a `hidden beast` number, since 2 + 1 + 6 + 7 + 4 + 2 + 556 + 86 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 216742556799 and 216742556808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 84962487 + ... + 84965037.

It is an arithmetic number, because the mean of its divisors is an integer number (4090141440).

Almost surely, 2^216742556862 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216742556862, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261769052160).

216742556862 is an abundant number, since it is smaller than the sum of its proper divisors (306795547458).

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

216742556862 is a wasteful number, since it uses less digits than its factorization.

216742556862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3655 (or 3649 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 54.

The spelling of 216742556862 in words is "two hundred sixteen billion, seven hundred forty-two million, five hundred fifty-six thousand, eight hundred sixty-two".