216577057 has 4 divisors (see below), whose sum is σ = 219543940. Its totient is φ = 213610176.

The previous prime is 216577033. The next prime is 216577063. The reversal of 216577057 is 750775612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 96805921 + 119771136 = 9839^2 + 10944^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216577057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216577007) 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, 1483332 + ... + 1483477.

It is an arithmetic number, because the mean of its divisors is an integer number (54885985).

Almost surely, 2^216577057 is an apocalyptic number.

It is an amenable number.

216577057 is a deficient number, since it is larger than the sum of its proper divisors (2966883).

216577057 is an equidigital number, since it uses as much as digits as its factorization.

216577057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2966882.

The product of its (nonzero) digits is 102900, while the sum is 40.

The square root of 216577057 is about 14716.5572400613. The cubic root of 216577057 is about 600.5338369264.

The spelling of 216577057 in words is "two hundred sixteen million, five hundred seventy-seven thousand, fifty-seven".