680923157 has 6 divisors (see below), whose sum is σ = 690653814. Its totient is φ = 671327720.

The previous prime is 680923129. The next prime is 680923181. The reversal of 680923157 is 751329086.

It can be written as a sum of positive squares in only one way, i.e., 497022436 + 183900721 = 22294^2 + 13561^2 .

It is not a de Polignac number, because 680923157 - 2⁸ = 680922901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680923127) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62498 + ... + 72579.

It is an arithmetic number, because the mean of its divisors is an integer number (115108969).

Almost surely, 2^680923157 is an apocalyptic number.

It is an amenable number.

680923157 is a deficient number, since it is larger than the sum of its proper divisors (9730657).

680923157 is an equidigital number, since it uses as much as digits as its factorization.

680923157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135219 (or 135148 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 680923157 is about 26094.5043447849. The cubic root of 680923157 is about 879.7636921453.

The spelling of 680923157 in words is "six hundred eighty million, nine hundred twenty-three thousand, one hundred fifty-seven".