680131918 has 4 divisors (see below), whose sum is σ = 1020197880. Its totient is φ = 340065958.

The previous prime is 680131913. The next prime is 680131927. The reversal of 680131918 is 819131086.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680131913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170032978 + ... + 170032981.

It is an arithmetic number, because the mean of its divisors is an integer number (255049470).

Almost surely, 2^680131918 is an apocalyptic number.

680131918 is a deficient number, since it is larger than the sum of its proper divisors (340065962).

680131918 is a wasteful number, since it uses less digits than its factorization.

680131918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340065961.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 680131918 is about 26079.3389103328. The cubic root of 680131918 is about 879.4227955565.

The spelling of 680131918 in words is "six hundred eighty million, one hundred thirty-one thousand, nine hundred eighteen".