161856928297 has 2 divisors, whose sum is σ = 161856928298. Its totient is φ = 161856928296.

The previous prime is 161856928231. The next prime is 161856928333. The reversal of 161856928297 is 792829658161.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113356115856 + 48500812441 = 336684^2 + 220229^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161856928297 is a prime.

It is not a weakly prime, because it can be changed into another prime (161856928697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80928464148 + 80928464149.

It is an arithmetic number, because the mean of its divisors is an integer number (80928464149).

Almost surely, 2^161856928297 is an apocalyptic number.

It is an amenable number.

161856928297 is a deficient number, since it is larger than the sum of its proper divisors (1).

161856928297 is an equidigital number, since it uses as much as digits as its factorization.

161856928297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26127360, while the sum is 64.

The spelling of 161856928297 in words is "one hundred sixty-one billion, eight hundred fifty-six million, nine hundred twenty-eight thousand, two hundred ninety-seven".