161636500 has 24 divisors (see below), whose sum is σ = 353015208. Its totient is φ = 64654400.

The previous prime is 161636491. The next prime is 161636509. The reversal of 161636500 is 5636161.

161636500 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161636491) and next prime (161636509).

It can be written as a sum of positive squares in 4 ways, for example, as 25867396 + 135769104 = 5086^2 + 11652^2 .

It is a super-2 number, since 2×161636500² = 52252716264500000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161636509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161137 + ... + 162136.

It is an arithmetic number, because the mean of its divisors is an integer number (14708967).

Almost surely, 2^161636500 is an apocalyptic number.

161636500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161636500 is an abundant number, since it is smaller than the sum of its proper divisors (191378708).

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

161636500 is a wasteful number, since it uses less digits than its factorization.

161636500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323292 (or 323280 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 161636500 is about 12713.6344134948. The cubic root of 161636500 is about 544.7281420560.

The spelling of 161636500 in words is "one hundred sixty-one million, six hundred thirty-six thousand, five hundred".