79811475911809 has 16 divisors (see below), whose sum is σ = 80429735232000. Its totient is φ = 79194357984384.

The previous prime is 79811475911803. The next prime is 79811475911963. The reversal of 79811475911809 is 90811957411897.

It is a cyclic number.

It is not a de Polignac number, because 79811475911809 - 2⁵ = 79811475911777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79811475911803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 610959702 + ... + 611090320.

It is an arithmetic number, because the mean of its divisors is an integer number (5026858452000).

Almost surely, 2^{79811475911809} is an apocalyptic number.

It is an amenable number.

79811475911809 is a deficient number, since it is larger than the sum of its proper divisors (618259320191).

79811475911809 is a wasteful number, since it uses less digits than its factorization.

79811475911809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134952.

The product of its (nonzero) digits is 45722880, while the sum is 70.

The spelling of 79811475911809 in words is "seventy-nine trillion, eight hundred eleven billion, four hundred seventy-five million, nine hundred eleven thousand, eight hundred nine".