161980311000 has 128 divisors (see below), whose sum is σ = 513944870400. Its totient is φ = 42462588800.

The previous prime is 161980310981. The next prime is 161980311007. The reversal of 161980311000 is 113089161.

161980311000 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161980311007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 280572 + ... + 634571.

It is an arithmetic number, because the mean of its divisors is an integer number (4015194300).

Almost surely, 2^161980311000 is an apocalyptic number.

161980311000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161980311000 is an abundant number, since it is smaller than the sum of its proper divisors (351964559400).

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

161980311000 is a wasteful number, since it uses less digits than its factorization.

161980311000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915226 (or 915212 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 30.

The spelling of 161980311000 in words is "one hundred sixty-one billion, nine hundred eighty million, three hundred eleven thousand".