161829537930 has 80 divisors (see below), whose sum is σ = 435437129160. Its totient is φ = 43125239808.

The previous prime is 161829537929. The next prime is 161829537959. The reversal of 161829537930 is 39735928161.

161829537930 is a `hidden beast` number, since 1 + 6 + 18 + 2 + 9 + 537 + 93 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 144309574161 + 17519963769 = 379881^2 + 132363^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1139002 + ... + 1273178.

Almost surely, 2^161829537930 is an apocalyptic number.

161829537930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161829537930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (217718564580).

161829537930 is an abundant number, since it is smaller than the sum of its proper divisors (273607591230).

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

161829537930 is a wasteful number, since it uses less digits than its factorization.

161829537930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135685 (or 135676 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The spelling of 161829537930 in words is "one hundred sixty-one billion, eight hundred twenty-nine million, five hundred thirty-seven thousand, nine hundred thirty".