680666654 has 8 divisors (see below), whose sum is σ = 1031526048. Its totient is φ = 336824640.

The previous prime is 680666639. The next prime is 680666671. The reversal of 680666654 is 456666086.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 680666599 and 680666608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1754102 + ... + 1754489.

It is an arithmetic number, because the mean of its divisors is an integer number (128940756).

Almost surely, 2^680666654 is an apocalyptic number.

680666654 is a deficient number, since it is larger than the sum of its proper divisors (350859394).

680666654 is a wasteful number, since it uses less digits than its factorization.

680666654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3508690.

The product of its (nonzero) digits is 1244160, while the sum is 47.

The square root of 680666654 is about 26089.5889963794. The cubic root of 680666654 is about 879.6532096013.

The spelling of 680666654 in words is "six hundred eighty million, six hundred sixty-six thousand, six hundred fifty-four".