161725900 has 72 divisors (see below), whose sum is σ = 402752000. Its totient is φ = 55218240.

The previous prime is 161725867. The next prime is 161725957. The reversal of 161725900 is 9527161.

161725900 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 323851 + ... + 324349.

Almost surely, 2^161725900 is an apocalyptic number.

161725900 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 161725900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201376000).

161725900 is an abundant number, since it is smaller than the sum of its proper divisors (241026100).

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

161725900 is a wasteful number, since it uses less digits than its factorization.

161725900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983 (or 976 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 161725900 is about 12717.1498379157. The cubic root of 161725900 is about 544.8285519683.

The spelling of 161725900 in words is "one hundred sixty-one million, seven hundred twenty-five thousand, nine hundred".