79905469091 has 12 divisors (see below), whose sum is σ = 94224569112. Its totient is φ = 67552174368.

The previous prime is 79905469079. The next prime is 79905469097. The reversal of 79905469091 is 19096450997.

It is a de Polignac number, because none of the positive numbers 2^k-79905469091 is a prime.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79905469091.

It is not an unprimeable number, because it can be changed into a prime (79905469097) 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 11 ways as a sum of consecutive naturals, for example, 11165765 + ... + 11172918.

It is an arithmetic number, because the mean of its divisors is an integer number (7852047426).

Almost surely, 2^79905469091 is an apocalyptic number.

79905469091 is a deficient number, since it is larger than the sum of its proper divisors (14319100021).

79905469091 is a wasteful number, since it uses less digits than its factorization.

79905469091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22338770 (or 22338763 counting only the distinct ones).

The product of its (nonzero) digits is 5511240, while the sum is 59.

The spelling of 79905469091 in words is "seventy-nine billion, nine hundred five million, four hundred sixty-nine thousand, ninety-one".