7979665566 has 16 divisors (see below), whose sum is σ = 15963223824. Its totient is φ = 2659239744.

The previous prime is 7979665537. The next prime is 7979665579. The reversal of 7979665566 is 6655669797.

It is a super-2 number, since 2×7979665566² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7979665497 and 7979665506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135201 + ... + 185036.

It is an arithmetic number, because the mean of its divisors is an integer number (997701489).

Almost surely, 2^7979665566 is an apocalyptic number.

7979665566 is an abundant number, since it is smaller than the sum of its proper divisors (7983558258).

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

7979665566 is a wasteful number, since it uses less digits than its factorization.

7979665566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324395.

The product of its digits is 128595600, while the sum is 66.

The square root of 7979665566 is about 89328.9738326821. The cubic root of 7979665566 is about 1998.3040260761.

The spelling of 7979665566 in words is "seven billion, nine hundred seventy-nine million, six hundred sixty-five thousand, five hundred sixty-six".