215722634164 has 6 divisors (see below), whose sum is σ = 377514609794. Its totient is φ = 107861317080.

The previous prime is 215722634161. The next prime is 215722634173. The reversal of 215722634164 is 461436227512.

It can be written as a sum of positive squares in only one way, i.e., 200435290000 + 15287344164 = 447700^2 + 123642^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 215722634164.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215722634161) 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 as a sum of consecutive naturals, namely, 26965329267 + ... + 26965329274.

Almost surely, 2^215722634164 is an apocalyptic number.

It is an amenable number.

215722634164 is a deficient number, since it is larger than the sum of its proper divisors (161791975630).

215722634164 is a wasteful number, since it uses less digits than its factorization.

215722634164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53930658545 (or 53930658543 counting only the distinct ones).

The product of its digits is 483840, while the sum is 43.

The spelling of 215722634164 in words is "two hundred fifteen billion, seven hundred twenty-two million, six hundred thirty-four thousand, one hundred sixty-four".