215668413 has 20 divisors (see below), whose sum is σ = 322804768. Its totient is φ = 143496360.

The previous prime is 215668403. The next prime is 215668417. The reversal of 215668413 is 314866512.

It is a happy number.

215668413 is a `hidden beast` number, since 2 + 1 + 566 + 84 + 13 = 666.

It is not a de Polignac number, because 215668413 - 2¹⁷ = 215537341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215668417) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 43920 + ... + 48582.

Almost surely, 2^215668413 is an apocalyptic number.

It is an amenable number.

215668413 is a deficient number, since it is larger than the sum of its proper divisors (107136355).

215668413 is an equidigital number, since it uses as much as digits as its factorization.

215668413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5246 (or 5237 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 215668413 is about 14685.6533051819. The cubic root of 215668413 is about 599.6928177586.

The spelling of 215668413 in words is "two hundred fifteen million, six hundred sixty-eight thousand, four hundred thirteen".