161964885 has 16 divisors (see below), whose sum is σ = 261011520. Its totient is φ = 85758720.

The previous prime is 161964857. The next prime is 161964889. The reversal of 161964885 is 588469161.

It is not a de Polignac number, because 161964885 - 2⁸ = 161964629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161964889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36756 + ... + 40925.

It is an arithmetic number, because the mean of its divisors is an integer number (16313220).

Almost surely, 2^161964885 is an apocalyptic number.

161964885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161964885 is a deficient number, since it is larger than the sum of its proper divisors (99046635).

161964885 is a wasteful number, since it uses less digits than its factorization.

161964885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77828.

The product of its digits is 414720, while the sum is 48.

The square root of 161964885 is about 12726.5425391188. The cubic root of 161964885 is about 545.0967872320.

The spelling of 161964885 in words is "one hundred sixty-one million, nine hundred sixty-four thousand, eight hundred eighty-five".