680138807 has 2 divisors, whose sum is σ = 680138808. Its totient is φ = 680138806.

The previous prime is 680138741. The next prime is 680138831. The reversal of 680138807 is 708831086.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 680138807 - 2²⁶ = 613029943 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680138857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340069403 + 340069404.

It is an arithmetic number, because the mean of its divisors is an integer number (340069404).

Almost surely, 2^680138807 is an apocalyptic number.

680138807 is a deficient number, since it is larger than the sum of its proper divisors (1).

680138807 is an equidigital number, since it uses as much as digits as its factorization.

680138807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 680138807 is about 26079.4709877329. The cubic root of 680138807 is about 879.4257647467.

The spelling of 680138807 in words is "six hundred eighty million, one hundred thirty-eight thousand, eight hundred seven".