161168640 has 216 divisors, whose sum is σ = 553596960. Its totient is φ = 39849984.

The previous prime is 161168639. The next prime is 161168647. The reversal of 161168640 is 46861161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161168647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3429097 + ... + 3429143.

Almost surely, 2^161168640 is an apocalyptic number.

161168640 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 161168640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276798480).

161168640 is an abundant number, since it is smaller than the sum of its proper divisors (392428320).

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

161168640 is an equidigital number, since it uses as much as digits as its factorization.

161168640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 161168640 is about 12695.2211481329. The cubic root of 161168640 is about 544.2020587344.

The spelling of 161168640 in words is "one hundred sixty-one million, one hundred sixty-eight thousand, six hundred forty".