79927690709 has 8 divisors (see below), whose sum is σ = 82320455640. Its totient is φ = 77547165696.

The previous prime is 79927690699. The next prime is 79927690723. The reversal of 79927690709 is 90709672997.

It can be written as a sum of positive squares in 4 ways, for example, as 37688398225 + 42239292484 = 194135^2 + 205522^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79927690709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79927690769) 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, 3046724 + ... + 3072845.

It is an arithmetic number, because the mean of its divisors is an integer number (10290056955).

Almost surely, 2^79927690709 is an apocalyptic number.

It is an amenable number.

79927690709 is a deficient number, since it is larger than the sum of its proper divisors (2392764931).

79927690709 is a wasteful number, since it uses less digits than its factorization.

79927690709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6119959.

The product of its (nonzero) digits is 27005076, while the sum is 65.

The spelling of 79927690709 in words is "seventy-nine billion, nine hundred twenty-seven million, six hundred ninety thousand, seven hundred nine".