161090660 has 12 divisors (see below), whose sum is σ = 338290428. Its totient is φ = 64436256.

The previous prime is 161090659. The next prime is 161090669. The reversal of 161090660 is 66090161.

It can be written as a sum of positive squares in 2 ways, for example, as 128097124 + 32993536 = 11318^2 + 5744^2 .

It is not an unprimeable number, because it can be changed into a prime (161090669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4027247 + ... + 4027286.

It is an arithmetic number, because the mean of its divisors is an integer number (28190869).

Almost surely, 2^161090660 is an apocalyptic number.

161090660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161090660 is an abundant number, since it is smaller than the sum of its proper divisors (177199768).

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

161090660 is a wasteful number, since it uses less digits than its factorization.

161090660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8054542 (or 8054540 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 161090660 is about 12692.1495421382. The cubic root of 161090660 is about 544.1142754812.

The spelling of 161090660 in words is "one hundred sixty-one million, ninety thousand, six hundred sixty".