215156244564 has 18 divisors (see below), whose sum is σ = 543867173850. Its totient is φ = 71718748176.

The previous prime is 215156244553. The next prime is 215156244571. The reversal of 215156244564 is 465442651512.

215156244564 is a `hidden beast` number, since 2 + 1 + 5 + 15 + 624 + 4 + 5 + 6 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 202057442064 + 13098802500 = 449508^2 + 114450^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2988281139 + ... + 2988281210.

Almost surely, 2^215156244564 is an apocalyptic number.

It is an amenable number.

215156244564 is an abundant number, since it is smaller than the sum of its proper divisors (328710929286).

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

215156244564 is a wasteful number, since it uses less digits than its factorization.

215156244564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5976562359 (or 5976562354 counting only the distinct ones).

The product of its digits is 1152000, while the sum is 45.

The spelling of 215156244564 in words is "two hundred fifteen billion, one hundred fifty-six million, two hundred forty-four thousand, five hundred sixty-four".