161423663 has 4 divisors (see below), whose sum is σ = 161612880. Its totient is φ = 161234448.

The previous prime is 161423641. The next prime is 161423693. The reversal of 161423663 is 366324161.

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

It is a cyclic number.

It is not a de Polignac number, because 161423663 - 2¹⁸ = 161161519 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 (161423693) 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, 93323 + ... + 95036.

It is an arithmetic number, because the mean of its divisors is an integer number (40403220).

Almost surely, 2^161423663 is an apocalyptic number.

161423663 is a deficient number, since it is larger than the sum of its proper divisors (189217).

161423663 is an equidigital number, since it uses as much as digits as its factorization.

161423663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189216.

The product of its digits is 15552, while the sum is 32.

The square root of 161423663 is about 12705.2612330483. The cubic root of 161423663 is about 544.4889443736.

The spelling of 161423663 in words is "one hundred sixty-one million, four hundred twenty-three thousand, six hundred sixty-three".