79357804985891 has 2 divisors, whose sum is σ = 79357804985892. Its totient is φ = 79357804985890.

The previous prime is 79357804985881. The next prime is 79357804985951. The reversal of 79357804985891 is 19858940875397.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79357804985891 - 2¹⁰ = 79357804984867 is a prime.

It is a super-2 number, since 2×79357804985891² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79357804985861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39678902492945 + 39678902492946.

It is an arithmetic number, because the mean of its divisors is an integer number (39678902492946).

Almost surely, 2^{79357804985891} is an apocalyptic number.

79357804985891 is a deficient number, since it is larger than the sum of its proper divisors (1).

79357804985891 is an equidigital number, since it uses as much as digits as its factorization.

79357804985891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5486745600, while the sum is 83.

The spelling of 79357804985891 in words is "seventy-nine trillion, three hundred fifty-seven billion, eight hundred four million, nine hundred eighty-five thousand, eight hundred ninety-one".