681656366 has 8 divisors (see below), whose sum is σ = 1022782680. Its totient is φ = 340728808.

The previous prime is 681656357. The next prime is 681656387. The reversal of 681656366 is 663656186.

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

It is a self number, because there is not a number n which added to its sum of digits gives 681656366.

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, 40796 + ... + 55023.

It is an arithmetic number, because the mean of its divisors is an integer number (127847835).

Almost surely, 2^681656366 is an apocalyptic number.

681656366 is a deficient number, since it is larger than the sum of its proper divisors (341126314).

681656366 is a wasteful number, since it uses less digits than its factorization.

681656366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99378.

The product of its digits is 933120, while the sum is 47.

The square root of 681656366 is about 26108.5496724732. The cubic root of 681656366 is about 880.0793514877.

The spelling of 681656366 in words is "six hundred eighty-one million, six hundred fifty-six thousand, three hundred sixty-six".