161521513444 has 12 divisors (see below), whose sum is σ = 282665464704. Its totient is φ = 80759952104.

The previous prime is 161521513429. The next prime is 161521513457. The reversal of 161521513444 is 444315125161.

It is a super-2 number, since 2×161521513444² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 663057 + ... + 873319.

It is an arithmetic number, because the mean of its divisors is an integer number (23555455392).

Almost surely, 2^161521513444 is an apocalyptic number.

It is an amenable number.

161521513444 is a deficient number, since it is larger than the sum of its proper divisors (121143951260).

161521513444 is a wasteful number, since it uses less digits than its factorization.

161521513444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402314 (or 402312 counting only the distinct ones).

The product of its digits is 57600, while the sum is 37.

The spelling of 161521513444 in words is "one hundred sixty-one billion, five hundred twenty-one million, five hundred thirteen thousand, four hundred forty-four".