161208644 has 12 divisors (see below), whose sum is σ = 282315264. Its totient is φ = 80547144.

The previous prime is 161208643. The next prime is 161208683. The reversal of 161208644 is 446802161.

161208644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 161208644.

It is not an unprimeable number, because it can be changed into a prime (161208643) 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, 7604 + ... + 19499.

It is an arithmetic number, because the mean of its divisors is an integer number (23526272).

Almost surely, 2^161208644 is an apocalyptic number.

It is an amenable number.

161208644 is a deficient number, since it is larger than the sum of its proper divisors (121106620).

161208644 is a wasteful number, since it uses less digits than its factorization.

161208644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28594 (or 28592 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 161208644 is about 12696.7966038682. The cubic root of 161208644 is about 544.2470808475.

The spelling of 161208644 in words is "one hundred sixty-one million, two hundred eight thousand, six hundred forty-four".