216862372656 has 160 divisors (see below), whose sum is σ = 639334080000. Its totient is φ = 70342255872.

The previous prime is 216862372637. The next prime is 216862372667. The reversal of 216862372656 is 656273268612.

216862372656 is a `hidden beast` number, since 2 + 1 + 6 + 8 + 623 + 7 + 2 + 6 + 5 + 6 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4975245 + ... + 5018643.

It is an arithmetic number, because the mean of its divisors is an integer number (3995838000).

Almost surely, 2^216862372656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216862372656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (319667040000).

216862372656 is an abundant number, since it is smaller than the sum of its proper divisors (422471707344).

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

216862372656 is a wasteful number, since it uses less digits than its factorization.

216862372656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43728 (or 43716 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 54.

The spelling of 216862372656 in words is "two hundred sixteen billion, eight hundred sixty-two million, three hundred seventy-two thousand, six hundred fifty-six".