16517222857 has 4 divisors (see below), whose sum is σ = 16546877316. Its totient is φ = 16487568400.

The previous prime is 16517222819. The next prime is 16517222863. The reversal of 16517222857 is 75822271561.

It is a happy number.

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 402443721 + 16114779136 = 20061^2 + 126944^2 .

It is a cyclic number.

It is not a de Polignac number, because 16517222857 - 2²⁷ = 16383005129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16517222867) 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, 14826394 + ... + 14827507.

It is an arithmetic number, because the mean of its divisors is an integer number (4136719329).

Almost surely, 2^16517222857 is an apocalyptic number.

It is an amenable number.

16517222857 is a deficient number, since it is larger than the sum of its proper divisors (29654459).

16517222857 is an equidigital number, since it uses as much as digits as its factorization.

16517222857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29654458.

The product of its digits is 470400, while the sum is 46.

The spelling of 16517222857 in words is "sixteen billion, five hundred seventeen million, two hundred twenty-two thousand, eight hundred fifty-seven".