161542811924 has 24 divisors (see below), whose sum is σ = 304861483080. Its totient is φ = 74456486784.

The previous prime is 161542811923. The next prime is 161542811929. The reversal of 161542811924 is 429118245161.

It can be written as a sum of positive squares in 4 ways, for example, as 8832240400 + 152710571524 = 93980^2 + 390782^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161542811923) 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, 2080979 + ... + 2157210.

It is an arithmetic number, because the mean of its divisors is an integer number (12702561795).

Almost surely, 2^161542811924 is an apocalyptic number.

It is an amenable number.

161542811924 is a deficient number, since it is larger than the sum of its proper divisors (143318671156).

161542811924 is a wasteful number, since it uses less digits than its factorization.

161542811924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4238939 (or 4238937 counting only the distinct ones).

The product of its digits is 138240, while the sum is 44.

The spelling of 161542811924 in words is "one hundred sixty-one billion, five hundred forty-two million, eight hundred eleven thousand, nine hundred twenty-four".