161275643 has 8 divisors (see below), whose sum is σ = 165458160. Its totient is φ = 157142880.

The previous prime is 161275627. The next prime is 161275657. The reversal of 161275643 is 346572161.

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

It is a cyclic number.

It is not a de Polignac number, because 161275643 - 2⁴ = 161275627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161275693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5828 + ... + 18881.

It is an arithmetic number, because the mean of its divisors is an integer number (20682270).

Almost surely, 2^161275643 is an apocalyptic number.

161275643 is a deficient number, since it is larger than the sum of its proper divisors (4182517).

161275643 is a wasteful number, since it uses less digits than its factorization.

161275643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24877.

The product of its digits is 30240, while the sum is 35.

The square root of 161275643 is about 12699.4347512005. The cubic root of 161275643 is about 544.3224675408.

The spelling of 161275643 in words is "one hundred sixty-one million, two hundred seventy-five thousand, six hundred forty-three".