161665760 has 24 divisors (see below), whose sum is σ = 381935736. Its totient is φ = 64666240.

The previous prime is 161665711. The next prime is 161665783. The reversal of 161665760 is 67566161.

161665760 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161665760² = 52271635912755200, 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 3 ways as a sum of consecutive naturals, for example, 505046 + ... + 505365.

It is an arithmetic number, because the mean of its divisors is an integer number (15913989).

Almost surely, 2^161665760 is an apocalyptic number.

161665760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161665760 is an abundant number, since it is smaller than the sum of its proper divisors (220269976).

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

161665760 is a wasteful number, since it uses less digits than its factorization.

161665760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010426 (or 1010418 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 161665760 is about 12714.7850945268. The cubic root of 161665760 is about 544.7610095989.

It can be divided in two parts, 1616 and 65760, that added together give a palindrome (67376).

The spelling of 161665760 in words is "one hundred sixty-one million, six hundred sixty-five thousand, seven hundred sixty".