216766522251 has 16 divisors (see below), whose sum is σ = 338037462400. Its totient is φ = 136905171624.

The previous prime is 216766522211. The next prime is 216766522261. The reversal of 216766522251 is 152225667612.

216766522251 is a `hidden beast` number, since 2 + 1 + 6 + 76 + 6 + 522 + 2 + 51 = 666.

It is not a de Polignac number, because 216766522251 - 2²¹ = 216764425099 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216766522197 and 216766522206.

It is not an unprimeable number, because it can be changed into a prime (216766522201) 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, 211272901 + ... + 211273926.

It is an arithmetic number, because the mean of its divisors is an integer number (21127341400).

Almost surely, 2^216766522251 is an apocalyptic number.

216766522251 is a deficient number, since it is larger than the sum of its proper divisors (121270940149).

216766522251 is a wasteful number, since it uses less digits than its factorization.

216766522251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422546855 (or 422546849 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The spelling of 216766522251 in words is "two hundred sixteen billion, seven hundred sixty-six million, five hundred twenty-two thousand, two hundred fifty-one".