165981450 has 24 divisors (see below), whose sum is σ = 411634368. Its totient is φ = 44261680.

The previous prime is 165981443. The next prime is 165981451. The reversal of 165981450 is 54189561.

It is a junction number, because it is equal to n+sod(n) for n = 165981399 and 165981408.

It is not an unprimeable number, because it can be changed into a prime (165981451) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 553122 + ... + 553421.

It is an arithmetic number, because the mean of its divisors is an integer number (17151432).

Almost surely, 2^165981450 is an apocalyptic number.

165981450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165981450 is an abundant number, since it is smaller than the sum of its proper divisors (245652918).

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

165981450 is a wasteful number, since it uses less digits than its factorization.

165981450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106558 (or 1106553 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 165981450 is about 12883.3788270003. The cubic root of 165981450 is about 549.5659937028.

The spelling of 165981450 in words is "one hundred sixty-five million, nine hundred eighty-one thousand, four hundred fifty".