816570013 has 4 divisors (see below), whose sum is σ = 933222880. Its totient is φ = 699917148.

The previous prime is 816569921. The next prime is 816570037. The reversal of 816570013 is 310075618.

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 816570013 - 2¹³ = 816561821 is a prime.

It is a super-2 number, since 2×816570013² = 1333573172261640338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816570113) 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, 58326423 + ... + 58326436.

It is an arithmetic number, because the mean of its divisors is an integer number (233305720).

Almost surely, 2^816570013 is an apocalyptic number.

It is an amenable number.

816570013 is a deficient number, since it is larger than the sum of its proper divisors (116652867).

816570013 is a wasteful number, since it uses less digits than its factorization.

816570013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116652866.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 816570013 is about 28575.6891955382. The cubic root of 816570013 is about 934.6832839238.

The spelling of 816570013 in words is "eight hundred sixteen million, five hundred seventy thousand, thirteen".