161540044 has 6 divisors (see below), whose sum is σ = 282695084. Its totient is φ = 80770020.

The previous prime is 161539997. The next prime is 161540047. The reversal of 161540044 is 440045161.

161540044 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (161540047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20192502 + ... + 20192509.

Almost surely, 2^161540044 is an apocalyptic number.

It is an amenable number.

161540044 is a deficient number, since it is larger than the sum of its proper divisors (121155040).

161540044 is a wasteful number, since it uses less digits than its factorization.

161540044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40385015 (or 40385013 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 161540044 is about 12709.8404395964. The cubic root of 161540044 is about 544.6197656423.

The spelling of 161540044 in words is "one hundred sixty-one million, five hundred forty thousand, forty-four".