165641450 has 24 divisors (see below), whose sum is σ = 331793868. Its totient is φ = 61159680.

The previous prime is 165641429. The next prime is 165641459. The reversal of 165641450 is 54146561.

It can be written as a sum of positive squares in 6 ways, for example, as 55160329 + 110481121 = 7427^2 + 10511^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165641459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126767 + ... + 128066.

Almost surely, 2^165641450 is an apocalyptic number.

165641450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165641450 is an abundant number, since it is smaller than the sum of its proper divisors (166152418).

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

165641450 is a wasteful number, since it uses less digits than its factorization.

165641450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254858 (or 254853 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 165641450 is about 12870.1767664628. The cubic root of 165641450 is about 549.1904895578.

The spelling of 165641450 in words is "one hundred sixty-five million, six hundred forty-one thousand, four hundred fifty".