165993418 has 8 divisors (see below), whose sum is σ = 249091812. Its totient is φ = 82962816.

The previous prime is 165993413. The next prime is 165993427. The reversal of 165993418 is 814399561.

It can be written as a sum of positive squares in 2 ways, for example, as 152102889 + 13890529 = 12333^2 + 3727^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (165993413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10305 + ... + 20932.

Almost surely, 2^165993418 is an apocalyptic number.

165993418 is a deficient number, since it is larger than the sum of its proper divisors (83098394).

165993418 is a wasteful number, since it uses less digits than its factorization.

165993418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33896.

The product of its digits is 233280, while the sum is 46.

The square root of 165993418 is about 12883.8432930551. The cubic root of 165993418 is about 549.5792021020.

The spelling of 165993418 in words is "one hundred sixty-five million, nine hundred ninety-three thousand, four hundred eighteen".