79811475911808 has 64 divisors (see below), whose sum is σ = 213403201475520. Its totient is φ = 26427641011200.

The previous prime is 79811475911803. The next prime is 79811475911963. The reversal of 79811475911808 is 80811957411897.

79811475911808 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×79811475911808² (a number of 29 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 688161835 + ... + 688277802.

It is an arithmetic number, because the mean of its divisors is an integer number (3334425023055).

Almost surely, 2^{79811475911808} is an apocalyptic number.

It is an amenable number.

79811475911808 is an abundant number, since it is smaller than the sum of its proper divisors (133591725563712).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

79811475911808 is a wasteful number, since it uses less digits than its factorization.

79811475911808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376439805 (or 1376439793 counting only the distinct ones).

The product of its (nonzero) digits is 40642560, while the sum is 69.

The spelling of 79811475911808 in words is "seventy-nine trillion, eight hundred eleven billion, four hundred seventy-five million, nine hundred eleven thousand, eight hundred eight".