215666132 has 24 divisors (see below), whose sum is σ = 425010432. Its totient is φ = 94867200.

The previous prime is 215666123. The next prime is 215666141. The reversal of 215666132 is 231666512.

It is an interprime number because it is at equal distance from previous prime (215666123) and next prime (215666141).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77693 + ... + 80420.

It is an arithmetic number, because the mean of its divisors is an integer number (17708768).

Almost surely, 2^215666132 is an apocalyptic number.

215666132 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

215666132 is a deficient number, since it is larger than the sum of its proper divisors (209344300).

215666132 is a wasteful number, since it uses less digits than its factorization.

215666132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158159 (or 158157 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The square root of 215666132 is about 14685.5756441482. The cubic root of 215666132 is about 599.6907035499.

The spelling of 215666132 in words is "two hundred fifteen million, six hundred sixty-six thousand, one hundred thirty-two".