161650500 has 192 divisors, whose sum is σ = 523950336. Its totient is φ = 38400000.

The previous prime is 161650493. The next prime is 161650529. The reversal of 161650500 is 5056161.

It is a super-2 number, since 2×161650500² = 52261768300500000, which contains 22 as substring.

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, 1600450 + ... + 1600550.

It is an arithmetic number, because the mean of its divisors is an integer number (2728908).

Almost surely, 2^161650500 is an apocalyptic number.

161650500 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 161650500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261975168).

161650500 is an abundant number, since it is smaller than the sum of its proper divisors (362299836).

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

161650500 is a wasteful number, since it uses less digits than its factorization.

161650500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 161650500 is about 12714.1849915754. The cubic root of 161650500 is about 544.7438686479.

The spelling of 161650500 in words is "one hundred sixty-one million, six hundred fifty thousand, five hundred".