161646955 has 4 divisors (see below), whose sum is σ = 193976352. Its totient is φ = 129317560.

The previous prime is 161646949. The next prime is 161646977. The reversal of 161646955 is 559646161.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 161646955 - 2⁵ = 161646923 is a prime.

It is a super-2 number, since 2×161646955² = 52259476121544050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16164691 + ... + 16164700.

It is an arithmetic number, because the mean of its divisors is an integer number (48494088).

Almost surely, 2^161646955 is an apocalyptic number.

161646955 is a deficient number, since it is larger than the sum of its proper divisors (32329397).

161646955 is an equidigital number, since it uses as much as digits as its factorization.

161646955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32329396.

The product of its digits is 194400, while the sum is 43.

The square root of 161646955 is about 12714.0455795942. The cubic root of 161646955 is about 544.7398865361.

The spelling of 161646955 in words is "one hundred sixty-one million, six hundred forty-six thousand, nine hundred fifty-five".