161509194124 has 24 divisors (see below), whose sum is σ = 301819190400. Its totient is φ = 75454794240.

The previous prime is 161509194113. The next prime is 161509194139. The reversal of 161509194124 is 421491905161.

It is a happy number.

161509194124 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 2×161509194124² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22453189 + ... + 22460380.

It is an arithmetic number, because the mean of its divisors is an integer number (12575799600).

Almost surely, 2^161509194124 is an apocalyptic number.

It is an amenable number.

161509194124 is a deficient number, since it is larger than the sum of its proper divisors (140309996276).

161509194124 is a wasteful number, since it uses less digits than its factorization.

161509194124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44913633 (or 44913631 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 43.

The spelling of 161509194124 in words is "one hundred sixty-one billion, five hundred nine million, one hundred ninety-four thousand, one hundred twenty-four".