79481666645 has 16 divisors (see below), whose sum is σ = 95712684912. Its totient is φ = 63362534400.

The previous prime is 79481666639. The next prime is 79481666707. The reversal of 79481666645 is 54666618497.

It can be written as a sum of positive squares in 8 ways, for example, as 3227262481 + 76254404164 = 56809^2 + 276142^2 .

It is not a de Polignac number, because 79481666645 - 2³⁰ = 78407924821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2011499 + ... + 2050631.

It is an arithmetic number, because the mean of its divisors is an integer number (5982042807).

Almost surely, 2^79481666645 is an apocalyptic number.

It is an amenable number.

79481666645 is a deficient number, since it is larger than the sum of its proper divisors (16231018267).

79481666645 is a wasteful number, since it uses less digits than its factorization.

79481666645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40552.

The product of its digits is 52254720, while the sum is 62.

The spelling of 79481666645 in words is "seventy-nine billion, four hundred eighty-one million, six hundred sixty-six thousand, six hundred forty-five".