161663234 has 16 divisors (see below), whose sum is σ = 257688216. Its totient is φ = 75801600.

The previous prime is 161663219. The next prime is 161663239. The reversal of 161663234 is 432366161.

It can be written as a sum of positive squares in 4 ways, for example, as 161366209 + 297025 = 12703^2 + 545^2 .

It is a super-2 number, since 2×161663234² = 52270002454677512, 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 161663234.

It is not an unprimeable number, because it can be changed into a prime (161663239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1094 + ... + 18014.

Almost surely, 2^161663234 is an apocalyptic number.

161663234 is a deficient number, since it is larger than the sum of its proper divisors (96024982).

161663234 is a wasteful number, since it uses less digits than its factorization.

161663234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17221.

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

The square root of 161663234 is about 12714.6857609616. The cubic root of 161663234 is about 544.7581723181.

The spelling of 161663234 in words is "one hundred sixty-one million, six hundred sixty-three thousand, two hundred thirty-four".