680908663 has 4 divisors (see below), whose sum is σ = 689527840. Its totient is φ = 672289488.

The previous prime is 680908637. The next prime is 680908691. The reversal of 680908663 is 366809086.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 680908663 - 2¹³ = 680900471 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 (680908363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4309470 + ... + 4309627.

It is an arithmetic number, because the mean of its divisors is an integer number (172381960).

Almost surely, 2^680908663 is an apocalyptic number.

680908663 is a deficient number, since it is larger than the sum of its proper divisors (8619177).

680908663 is an equidigital number, since it uses as much as digits as its factorization.

680908663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8619176.

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 680908663 is about 26094.2266219944. The cubic root of 680908663 is about 879.7574499405.

The spelling of 680908663 in words is "six hundred eighty million, nine hundred eight thousand, six hundred sixty-three".