681634166 has 8 divisors (see below), whose sum is σ = 1041742944. Its totient is φ = 334386520.

The previous prime is 681634147. The next prime is 681634171. The reversal of 681634166 is 661436186.

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

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, 3215150 + ... + 3215361.

It is an arithmetic number, because the mean of its divisors is an integer number (130217868).

Almost surely, 2^681634166 is an apocalyptic number.

681634166 is a deficient number, since it is larger than the sum of its proper divisors (360108778).

681634166 is a wasteful number, since it uses less digits than its factorization.

681634166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6430566.

The product of its digits is 124416, while the sum is 41.

The square root of 681634166 is about 26108.1245209226. The cubic root of 681634166 is about 880.0697973220.

The spelling of 681634166 in words is "six hundred eighty-one million, six hundred thirty-four thousand, one hundred sixty-six".