216558057 has 4 divisors (see below), whose sum is σ = 288744080. Its totient is φ = 144372036.

The previous prime is 216558047. The next prime is 216558061. The reversal of 216558057 is 750855612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 216558057 - 2¹¹ = 216556009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216558007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36093007 + ... + 36093012.

It is an arithmetic number, because the mean of its divisors is an integer number (72186020).

Almost surely, 2^216558057 is an apocalyptic number.

It is an amenable number.

216558057 is a deficient number, since it is larger than the sum of its proper divisors (72186023).

216558057 is an equidigital number, since it uses as much as digits as its factorization.

216558057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72186022.

The product of its (nonzero) digits is 84000, while the sum is 39.

The square root of 216558057 is about 14715.9116944891. The cubic root of 216558057 is about 600.5162750838.

The spelling of 216558057 in words is "two hundred sixteen million, five hundred fifty-eight thousand, fifty-seven".