161610040 has 64 divisors (see below), whose sum is σ = 379468800. Its totient is φ = 61867008.

The previous prime is 161610023. The next prime is 161610061. The reversal of 161610040 is 40016161.

It is a happy number.

161610040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161610040² = 52235610057603200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146772 + ... + 147868.

It is an arithmetic number, because the mean of its divisors is an integer number (5929200).

Almost surely, 2^161610040 is an apocalyptic number.

161610040 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 161610040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189734400).

161610040 is an abundant number, since it is smaller than the sum of its proper divisors (217858760).

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

161610040 is a wasteful number, since it uses less digits than its factorization.

161610040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1264 (or 1260 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 161610040 is about 12712.5937557998. The cubic root of 161610040 is about 544.6984163171.

The spelling of 161610040 in words is "one hundred sixty-one million, six hundred ten thousand, forty".