161975761967 has 2 divisors, whose sum is σ = 161975761968. Its totient is φ = 161975761966.

The previous prime is 161975761901. The next prime is 161975761973. The reversal of 161975761967 is 769167579161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161975761967 - 2²⁸ = 161707326511 is a prime.

It is a super-2 number, since 2×161975761967² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161975761067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80987880983 + 80987880984.

It is an arithmetic number, because the mean of its divisors is an integer number (80987880984).

Almost surely, 2^161975761967 is an apocalyptic number.

161975761967 is a deficient number, since it is larger than the sum of its proper divisors (1).

161975761967 is an equidigital number, since it uses as much as digits as its factorization.

161975761967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30005640, while the sum is 65.

The spelling of 161975761967 in words is "one hundred sixty-one billion, nine hundred seventy-five million, seven hundred sixty-one thousand, nine hundred sixty-seven".