816716507 has 4 divisors (see below), whose sum is σ = 816868176. Its totient is φ = 816564840.

The previous prime is 816716471. The next prime is 816716609. The reversal of 816716507 is 705617618.

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

It is a cyclic number.

It is not a de Polignac number, because 816716507 - 2⁶ = 816716443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816716107) 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, 67448 + ... + 78629.

It is an arithmetic number, because the mean of its divisors is an integer number (204217044).

Almost surely, 2^816716507 is an apocalyptic number.

816716507 is a deficient number, since it is larger than the sum of its proper divisors (151669).

816716507 is a wasteful number, since it uses less digits than its factorization.

816716507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151668.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 816716507 is about 28578.2523433467. The cubic root of 816716507 is about 934.7391751531.

The spelling of 816716507 in words is "eight hundred sixteen million, seven hundred sixteen thousand, five hundred seven".