16572320858 has 4 divisors (see below), whose sum is σ = 24858481290. Its totient is φ = 8286160428.

The previous prime is 16572320839. The next prime is 16572320861. The reversal of 16572320858 is 85802327561.

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

It can be written as a sum of positive squares in only one way, i.e., 10329266689 + 6243054169 = 101633^2 + 79013^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4143080213 + ... + 4143080216.

Almost surely, 2^16572320858 is an apocalyptic number.

16572320858 is a deficient number, since it is larger than the sum of its proper divisors (8286160432).

16572320858 is an equidigital number, since it uses as much as digits as its factorization.

16572320858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8286160431.

The product of its (nonzero) digits is 806400, while the sum is 47.

The spelling of 16572320858 in words is "sixteen billion, five hundred seventy-two million, three hundred twenty thousand, eight hundred fifty-eight".