79956666 has 16 divisors (see below), whose sum is σ = 177681600. Its totient is φ = 26652204.

The previous prime is 79956649. The next prime is 79956673. The reversal of 79956666 is 66665997.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 1480679 = 79956666 / (7 + 9 + 9 + 5 + 6 + 6 + 6 + 6).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 740286 + ... + 740393.

It is an arithmetic number, because the mean of its divisors is an integer number (11105100).

Almost surely, 2^79956666 is an apocalyptic number.

79956666 is an abundant number, since it is smaller than the sum of its proper divisors (97724934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

79956666 is a wasteful number, since it uses less digits than its factorization.

79956666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1480690 (or 1480684 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 54.

The square root of 79956666 is about 8941.8491376225. The cubic root of 79956666 is about 430.8091237273.

The spelling of 79956666 in words is "seventy-nine million, nine hundred fifty-six thousand, six hundred sixty-six".