679631661 has 16 divisors (see below), whose sum is σ = 1066089600. Its totient is φ = 426435264.

The previous prime is 679631647. The next prime is 679631699. The reversal of 679631661 is 166136976.

679631661 is a `hidden beast` number, since 6 + 7 + 9 + 631 + 6 + 6 + 1 = 666.

It is not a de Polignac number, because 679631661 - 2⁵ = 679631629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679631461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 739881 + ... + 740798.

It is an arithmetic number, because the mean of its divisors is an integer number (66630600).

Almost surely, 2^679631661 is an apocalyptic number.

It is an amenable number.

679631661 is a deficient number, since it is larger than the sum of its proper divisors (386457939).

679631661 is a wasteful number, since it uses less digits than its factorization.

679631661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1480705 (or 1480699 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 679631661 is about 26069.7460862203. The cubic root of 679631661 is about 879.2071289070.

The spelling of 679631661 in words is "six hundred seventy-nine million, six hundred thirty-one thousand, six hundred sixty-one".