216111256956 has 48 divisors (see below), whose sum is σ = 640329652480. Its totient is φ = 61746073200.

The previous prime is 216111256931. The next prime is 216111256957. The reversal of 216111256956 is 659652111612.

216111256956 is a `hidden beast` number, since 2 + 1 + 611 + 1 + 25 + 6 + 9 + 5 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216111256957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142929970 + ... + 142931481.

Almost surely, 2^216111256956 is an apocalyptic number.

It is an amenable number.

216111256956 is an abundant number, since it is smaller than the sum of its proper divisors (424218395524).

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

216111256956 is a wasteful number, since it uses less digits than its factorization.

216111256956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285861471 (or 285861463 counting only the distinct ones).

The product of its digits is 194400, while the sum is 45.

The spelling of 216111256956 in words is "two hundred sixteen billion, one hundred eleven million, two hundred fifty-six thousand, nine hundred fifty-six".