216459657 has 24 divisors (see below), whose sum is σ = 340012296. Its totient is φ = 132143616.

The previous prime is 216459631. The next prime is 216459679. The reversal of 216459657 is 756954612.

216459657 is a `hidden beast` number, since 2 + 1 + 6 + 4 + 596 + 57 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 105452361 + 111007296 = 10269^2 + 10536^2 .

It is not a de Polignac number, because 216459657 - 2¹⁰ = 216458633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216459697) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13458 + ... + 24779.

It is an arithmetic number, because the mean of its divisors is an integer number (14167179).

Almost surely, 2^216459657 is an apocalyptic number.

It is an amenable number.

216459657 is a deficient number, since it is larger than the sum of its proper divisors (123552639).

216459657 is a wasteful number, since it uses less digits than its factorization.

216459657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38297 (or 38294 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 216459657 is about 14712.5679947452. The cubic root of 216459657 is about 600.4253067857.

The spelling of 216459657 in words is "two hundred sixteen million, four hundred fifty-nine thousand, six hundred fifty-seven".