161966610 has 48 divisors (see below), whose sum is σ = 453509784. Its totient is φ = 39868416.

The previous prime is 161966557. The next prime is 161966639. The reversal of 161966610 is 16669161.

It can be written as a sum of positive squares in 4 ways, for example, as 149157369 + 12809241 = 12213^2 + 3579^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68047 + ... + 70386.

Almost surely, 2^161966610 is an apocalyptic number.

161966610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161966610 is an abundant number, since it is smaller than the sum of its proper divisors (291543174).

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

161966610 is a wasteful number, since it uses less digits than its factorization.

161966610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138459 (or 138456 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 161966610 is about 12726.6103106837. The cubic root of 161966610 is about 545.0987224018.

The spelling of 161966610 in words is "one hundred sixty-one million, nine hundred sixty-six thousand, six hundred ten".