161858161120 has 48 divisors (see below), whose sum is σ = 382446253728. Its totient is φ = 64733724160.

The previous prime is 161858161079. The next prime is 161858161133. The reversal of 161858161120 is 21161858161.

It is a super-2 number, since 2×161858161120² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1069350 + ... + 1211290.

It is an arithmetic number, because the mean of its divisors is an integer number (7967630286).

Almost surely, 2^161858161120 is an apocalyptic number.

161858161120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161858161120 is an abundant number, since it is smaller than the sum of its proper divisors (220588092608).

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

161858161120 is a wasteful number, since it uses less digits than its factorization.

161858161120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149083 (or 149075 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 40.

The spelling of 161858161120 in words is "one hundred sixty-one billion, eight hundred fifty-eight million, one hundred sixty-one thousand, one hundred twenty".