216167257 has 4 divisors (see below), whose sum is σ = 228882996. Its totient is φ = 203451520.

The previous prime is 216167251. The next prime is 216167269. The reversal of 216167257 is 752761612.

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 76667536 + 139499721 = 8756^2 + 11811^2 .

It is a cyclic number.

It is not a de Polignac number, because 216167257 - 2¹⁵ = 216134489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216167251) 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, 6357844 + ... + 6357877.

It is an arithmetic number, because the mean of its divisors is an integer number (57220749).

Almost surely, 2^216167257 is an apocalyptic number.

It is an amenable number.

216167257 is a deficient number, since it is larger than the sum of its proper divisors (12715739).

216167257 is a wasteful number, since it uses less digits than its factorization.

216167257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12715738.

The product of its digits is 35280, while the sum is 37.

The square root of 216167257 is about 14702.6275542843. The cubic root of 216167257 is about 600.1548276365.

The spelling of 216167257 in words is "two hundred sixteen million, one hundred sixty-seven thousand, two hundred fifty-seven".