79811475911969 has 2 divisors, whose sum is σ = 79811475911970. Its totient is φ = 79811475911968.

The previous prime is 79811475911963. The next prime is 79811475912043. The reversal of 79811475911969 is 96911957411897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78718363841569 + 1093112070400 = 8872337^2 + 1045520^2 .

It is a cyclic number.

It is not a de Polignac number, because 79811475911969 - 2²⁸ = 79811207476513 is a prime.

It is a super-2 number, since 2×79811475911969² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 79811475911969.

It is not a weakly prime, because it can be changed into another prime (79811475911963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39905737955984 + 39905737955985.

It is an arithmetic number, because the mean of its divisors is an integer number (39905737955985).

Almost surely, 2^{79811475911969} is an apocalyptic number.

It is an amenable number.

79811475911969 is a deficient number, since it is larger than the sum of its proper divisors (1).

79811475911969 is an equidigital number, since it uses as much as digits as its factorization.

79811475911969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 308629440, while the sum is 77.

The spelling of 79811475911969 in words is "seventy-nine trillion, eight hundred eleven billion, four hundred seventy-five million, nine hundred eleven thousand, nine hundred sixty-nine".