161913604188 has 48 divisors (see below), whose sum is σ = 431813088000. Its totient is φ = 46256371584.

The previous prime is 161913604187. The next prime is 161913604201. The reversal of 161913604188 is 881406319161.

It is a happy number.

It is a super-2 number, since 2×161913604188² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161913604187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 790120 + ... + 973712.

It is an arithmetic number, because the mean of its divisors is an integer number (8996106000).

Almost surely, 2^161913604188 is an apocalyptic number.

It is an amenable number.

161913604188 is an abundant number, since it is smaller than the sum of its proper divisors (269899483812).

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

161913604188 is a wasteful number, since it uses less digits than its factorization.

161913604188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194106 (or 194104 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 48.

The spelling of 161913604188 in words is "one hundred sixty-one billion, nine hundred thirteen million, six hundred four thousand, one hundred eighty-eight".