161664744 has 32 divisors (see below), whose sum is σ = 409036320. Its totient is φ = 53238336.

The previous prime is 161664743. The next prime is 161664751. The reversal of 161664744 is 447466161.

161664744 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161664744² = 52270978905171072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161664743) 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, 38587 + ... + 42570.

It is an arithmetic number, because the mean of its divisors is an integer number (12782385).

Almost surely, 2^161664744 is an apocalyptic number.

It is an amenable number.

161664744 is an abundant number, since it is smaller than the sum of its proper divisors (247371576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161664744 is a wasteful number, since it uses less digits than its factorization.

161664744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81249 (or 81245 counting only the distinct ones).

The product of its digits is 96768, while the sum is 39.

The square root of 161664744 is about 12714.7451409771. The cubic root of 161664744 is about 544.7598684000.

It can be divided in two parts, 16166 and 4744, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 161664744 in words is "one hundred sixty-one million, six hundred sixty-four thousand, seven hundred forty-four".