161229171967 has 4 divisors (see below), whose sum is σ = 169714917880. Its totient is φ = 152743426056.

The previous prime is 161229171877. The next prime is 161229171991. The reversal of 161229171967 is 769171922161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 769171922161 = 881 ⋅873066881.

It is a cyclic number.

It is not a de Polignac number, because 161229171967 - 2¹¹ = 161229169919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161229171067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4242872928 + ... + 4242872965.

It is an arithmetic number, because the mean of its divisors is an integer number (42428729470).

Almost surely, 2^161229171967 is an apocalyptic number.

161229171967 is a deficient number, since it is larger than the sum of its proper divisors (8485745913).

161229171967 is an equidigital number, since it uses as much as digits as its factorization.

161229171967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8485745912.

The product of its digits is 571536, while the sum is 52.

The spelling of 161229171967 in words is "one hundred sixty-one billion, two hundred twenty-nine million, one hundred seventy-one thousand, nine hundred sixty-seven".