215666052 has 96 divisors (see below), whose sum is σ = 592435200. Its totient is φ = 61034400.

The previous prime is 215666041. The next prime is 215666053. The reversal of 215666052 is 250666512.

It is a happy number.

215666052 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (215666053) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 621343 + ... + 621689.

It is an arithmetic number, because the mean of its divisors is an integer number (6171200).

Almost surely, 2^215666052 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215666052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296217600).

215666052 is an abundant number, since it is smaller than the sum of its proper divisors (376769148).

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

215666052 is a wasteful number, since it uses less digits than its factorization.

215666052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526 (or 510 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 215666052 is about 14685.5729203869. The cubic root of 215666052 is about 599.6906293994.

The spelling of 215666052 in words is "two hundred fifteen million, six hundred sixty-six thousand, fifty-two".