165981402 has 12 divisors (see below), whose sum is σ = 359626410. Its totient is φ = 55327128.

The previous prime is 165981401. The next prime is 165981443. The reversal of 165981402 is 204189561.

165981402 is a `hidden beast` number, since 165 + 98 + 1 + 402 = 666.

It can be written as a sum of positive squares in only one way, i.e., 165405321 + 576081 = 12861^2 + 759^2 .

It is not an unprimeable number, because it can be changed into a prime (165981401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4610577 + ... + 4610612.

Almost surely, 2^165981402 is an apocalyptic number.

165981402 is an abundant number, since it is smaller than the sum of its proper divisors (193645008).

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

165981402 is a wasteful number, since it uses less digits than its factorization.

165981402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9221197 (or 9221194 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 165981402 is about 12883.3769641348. The cubic root of 165981402 is about 549.5659407267.

The spelling of 165981402 in words is "one hundred sixty-five million, nine hundred eighty-one thousand, four hundred two".