161918757072 has 60 divisors (see below), whose sum is σ = 467765311104. Its totient is φ = 52231855680.

The previous prime is 161918757071. The next prime is 161918757079. The reversal of 161918757072 is 270757819161.

161918757072 is a `hidden beast` number, since 1 + 61 + 9 + 1 + 8 + 7 + 570 + 7 + 2 = 666.

161918757072 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161918757071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18131598 + ... + 18140525.

Almost surely, 2^161918757072 is an apocalyptic number.

161918757072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161918757072 is an abundant number, since it is smaller than the sum of its proper divisors (305846554032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161918757072 is a wasteful number, since it uses less digits than its factorization.

161918757072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36272168 (or 36272159 counting only the distinct ones).

The product of its (nonzero) digits is 1481760, while the sum is 54.

The spelling of 161918757072 in words is "one hundred sixty-one billion, nine hundred eighteen million, seven hundred fifty-seven thousand, seventy-two".