216697722164 has 24 divisors (see below), whose sum is σ = 472795030848. Its totient is φ = 84427683840.

The previous prime is 216697722133. The next prime is 216697722169. The reversal of 216697722164 is 461227796612.

It is a super-2 number, since 2×216697722164² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216697722169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351781709 + ... + 351782324.

It is an arithmetic number, because the mean of its divisors is an integer number (19699792952).

Almost surely, 2^216697722164 is an apocalyptic number.

It is an amenable number.

216697722164 is an abundant number, since it is smaller than the sum of its proper divisors (256097308684).

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

216697722164 is a wasteful number, since it uses less digits than its factorization.

216697722164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703564055 (or 703564053 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 53.

The spelling of 216697722164 in words is "two hundred sixteen billion, six hundred ninety-seven million, seven hundred twenty-two thousand, one hundred sixty-four".