158318477809 has 2 divisors, whose sum is σ = 158318477810. Its totient is φ = 158318477808.

The previous prime is 158318477803. The next prime is 158318477819. The reversal of 158318477809 is 908774813851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136131481600 + 22186996209 = 368960^2 + 148953^2 .

It is an emirp because it is prime and its reverse (908774813851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 158318477809 - 2⁵ = 158318477777 is a prime.

It is not a weakly prime, because it can be changed into another prime (158318477803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79159238904 + 79159238905.

It is an arithmetic number, because the mean of its divisors is an integer number (79159238905).

Almost surely, 2^158318477809 is an apocalyptic number.

It is an amenable number.

158318477809 is a deficient number, since it is larger than the sum of its proper divisors (1).

158318477809 is an equidigital number, since it uses as much as digits as its factorization.

158318477809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13547520, while the sum is 61.

The spelling of 158318477809 in words is "one hundred fifty-eight billion, three hundred eighteen million, four hundred seventy-seven thousand, eight hundred nine".