79660081 has 2 divisors, whose sum is σ = 79660082. Its totient is φ = 79660080.

The previous prime is 79660069. The next prime is 79660151. The reversal of 79660081 is 18006697.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76387600 + 3272481 = 8740^2 + 1809^2 .

It is a cyclic number.

It is not a de Polignac number, because 79660081 - 2⁷ = 79659953 is a prime.

It is a super-2 number, since 2×79660081² = 12691457009853122, which contains 22 as substring.

It is equal to p_4650796 and since 79660081 and 4650796 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79660081.

It is not a weakly prime, because it can be changed into another prime (79660481) 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 as a sum of consecutive naturals, namely, 39830040 + 39830041.

It is an arithmetic number, because the mean of its divisors is an integer number (39830041).

Almost surely, 2^79660081 is an apocalyptic number.

It is an amenable number.

79660081 is a deficient number, since it is larger than the sum of its proper divisors (1).

79660081 is an equidigital number, since it uses as much as digits as its factorization.

79660081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 79660081 is about 8925.2496323632. The cubic root of 79660081 is about 430.2757938682.

The spelling of 79660081 in words is "seventy-nine million, six hundred sixty thousand, eighty-one".