161965760954857 has 2 divisors, whose sum is σ = 161965760954858. Its totient is φ = 161965760954856.

The previous prime is 161965760954821. The next prime is 161965760954887. The reversal of 161965760954857 is 758459067569161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133940902544656 + 28024858410201 = 11573284^2 + 5293851^2 .

It is a cyclic number.

It is not a de Polignac number, because 161965760954857 - 2³⁹ = 161416005140969 is a prime.

It is not a weakly prime, because it can be changed into another prime (161965760954807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80982880477428 + 80982880477429.

It is an arithmetic number, because the mean of its divisors is an integer number (80982880477429).

Almost surely, 2^{161965760954857} is an apocalyptic number.

It is an amenable number.

161965760954857 is a deficient number, since it is larger than the sum of its proper divisors (1).

161965760954857 is an equidigital number, since it uses as much as digits as its factorization.

161965760954857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3429216000, while the sum is 79.

The spelling of 161965760954857 in words is "one hundred sixty-one trillion, nine hundred sixty-five billion, seven hundred sixty million, nine hundred fifty-four thousand, eight hundred fifty-seven".