680816815 has 16 divisors (see below), whose sum is σ = 947630592. Its totient is φ = 459876384.

The previous prime is 680816783. The next prime is 680816821. The reversal of 680816815 is 518618086.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 680816815 - 2⁵ = 680816783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142819 + ... + 147508.

It is an arithmetic number, because the mean of its divisors is an integer number (59226912).

Almost surely, 2^680816815 is an apocalyptic number.

680816815 is a deficient number, since it is larger than the sum of its proper divisors (266813777).

680816815 is a wasteful number, since it uses less digits than its factorization.

680816815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290406.

The product of its (nonzero) digits is 92160, while the sum is 43.

The square root of 680816815 is about 26092.4666331108. The cubic root of 680816815 is about 879.7178912350.

The spelling of 680816815 in words is "six hundred eighty million, eight hundred sixteen thousand, eight hundred fifteen".