161644154 has 8 divisors (see below), whose sum is σ = 277104288. Its totient is φ = 69276060.

The previous prime is 161644123. The next prime is 161644163. The reversal of 161644154 is 451446161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×161644154² = 52257665044751432, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 161644154.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5772992 + ... + 5773019.

It is an arithmetic number, because the mean of its divisors is an integer number (34638036).

Almost surely, 2^161644154 is an apocalyptic number.

161644154 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

161644154 is a deficient number, since it is larger than the sum of its proper divisors (115460134).

161644154 is a wasteful number, since it uses less digits than its factorization.

161644154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11546020.

The product of its digits is 11520, while the sum is 32.

The square root of 161644154 is about 12713.9354253512. The cubic root of 161644154 is about 544.7367401210.

The spelling of 161644154 in words is "one hundred sixty-one million, six hundred forty-four thousand, one hundred fifty-four".