161651344 has 20 divisors (see below), whose sum is σ = 313444224. Its totient is φ = 80762528.

The previous prime is 161651339. The next prime is 161651387. The reversal of 161651344 is 443156161.

It is a super-2 number, since 2×161651344² = 52262314034012672, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22569 + ... + 28855.

Almost surely, 2^161651344 is an apocalyptic number.

It is an amenable number.

161651344 is a deficient number, since it is larger than the sum of its proper divisors (151792880).

161651344 is a wasteful number, since it uses less digits than its factorization.

161651344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7902 (or 7896 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 161651344 is about 12714.2181828062. The cubic root of 161651344 is about 544.7448167077.

The spelling of 161651344 in words is "one hundred sixty-one million, six hundred fifty-one thousand, three hundred forty-four".