161964002 has 6 divisors (see below), whose sum is σ = 242973003. Its totient is φ = 80973002.

The previous prime is 161963987. The next prime is 161964007. The reversal of 161964002 is 200469161.

It can be written as a sum of positive squares in only one way, i.e., 80982001 + 80982001 = 8999^2 + 8999^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=8999.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161964007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 13499 + ... + 22497.

Almost surely, 2^161964002 is an apocalyptic number.

161964002 is a deficient number, since it is larger than the sum of its proper divisors (81009001).

161964002 is an frugal number, since it uses more digits than its factorization.

161964002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18000 (or 9001 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 161964002 is about 12726.5078477955. The cubic root of 161964002 is about 545.0957966442.

Multiplying 161964002 by its product of nonzero digits (2592), we get a square (419810693184 = 647928²).

The spelling of 161964002 in words is "one hundred sixty-one million, nine hundred sixty-four thousand, two".