79969966 has 8 divisors (see below), whose sum is σ = 120016944. Its totient is φ = 39964320.

The previous prime is 79969961. The next prime is 79969969. The reversal of 79969966 is 66996997.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79969961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4930 + ... + 13573.

It is an arithmetic number, because the mean of its divisors is an integer number (15002118).

Almost surely, 2^79969966 is an apocalyptic number.

79969966 is a deficient number, since it is larger than the sum of its proper divisors (40046978).

79969966 is a wasteful number, since it uses less digits than its factorization.

79969966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20666.

The product of its digits is 9920232, while the sum is 61.

The square root of 79969966 is about 8942.5928007486. The cubic root of 79969966 is about 430.8330093475.

The spelling of 79969966 in words is "seventy-nine million, nine hundred sixty-nine thousand, nine hundred sixty-six".