79380566566 has 16 divisors (see below), whose sum is σ = 139758836256. Its totient is φ = 33100776576.

The previous prime is 79380566561. The next prime is 79380566569. The reversal of 79380566566 is 66566508397.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79380566561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76621651 + ... + 76622686.

It is an arithmetic number, because the mean of its divisors is an integer number (8734927266).

Almost surely, 2^79380566566 is an apocalyptic number.

79380566566 is a deficient number, since it is larger than the sum of its proper divisors (60378269690).

79380566566 is a wasteful number, since it uses less digits than its factorization.

79380566566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153244383.

The product of its (nonzero) digits is 48988800, while the sum is 61.

The spelling of 79380566566 in words is "seventy-nine billion, three hundred eighty million, five hundred sixty-six thousand, five hundred sixty-six".