161884909500 has 192 divisors, whose sum is σ = 478998793728. Its totient is φ = 42477120000.

The previous prime is 161884909489. The next prime is 161884909517. The reversal of 161884909500 is 5909488161.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 53762995 + ... + 53766005.

It is an arithmetic number, because the mean of its divisors is an integer number (2494785384).

Almost surely, 2^161884909500 is an apocalyptic number.

161884909500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161884909500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239499396864).

161884909500 is an abundant number, since it is smaller than the sum of its proper divisors (317113884228).

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

161884909500 is a wasteful number, since it uses less digits than its factorization.

161884909500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3597 (or 3585 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 51.

The spelling of 161884909500 in words is "one hundred sixty-one billion, eight hundred eighty-four million, nine hundred nine thousand, five hundred".