215772845568 has 160 divisors (see below), whose sum is σ = 662128287744. Its totient is φ = 61163569152.

The previous prime is 215772845557. The next prime is 215772845581. The reversal of 215772845568 is 865548277512.

It is a happy number.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1286496 + ... + 1444512.

Almost surely, 2^215772845568 is an apocalyptic number.

215772845568 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215772845568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (331064143872).

215772845568 is an abundant number, since it is smaller than the sum of its proper divisors (446355442176).

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

215772845568 is a wasteful number, since it uses less digits than its factorization.

215772845568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158172 (or 158156 counting only the distinct ones).

The product of its digits is 37632000, while the sum is 60.

The spelling of 215772845568 in words is "two hundred fifteen billion, seven hundred seventy-two million, eight hundred forty-five thousand, five hundred sixty-eight".