680665982 has 4 divisors (see below), whose sum is σ = 1020998976. Its totient is φ = 340332990.

The previous prime is 680665961. The next prime is 680665987. The reversal of 680665982 is 289566086.

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

It is a self number, because there is not a number n which added to its sum of digits gives 680665982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680665987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170166494 + ... + 170166497.

It is an arithmetic number, because the mean of its divisors is an integer number (255249744).

Almost surely, 2^680665982 is an apocalyptic number.

680665982 is a deficient number, since it is larger than the sum of its proper divisors (340332994).

680665982 is a wasteful number, since it uses less digits than its factorization.

680665982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340332993.

The product of its (nonzero) digits is 1244160, while the sum is 50.

The square root of 680665982 is about 26089.5761176758. The cubic root of 680665982 is about 879.6529201169.

The spelling of 680665982 in words is "six hundred eighty million, six hundred sixty-five thousand, nine hundred eighty-two".