165666450 has 48 divisors (see below), whose sum is σ = 411732576. Its totient is φ = 44083200.

The previous prime is 165666443. The next prime is 165666467. The reversal of 165666450 is 54666561.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 165666399 and 165666408.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 95289 + ... + 97011.

It is an arithmetic number, because the mean of its divisors is an integer number (8577762).

Almost surely, 2^165666450 is an apocalyptic number.

165666450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165666450 is an abundant number, since it is smaller than the sum of its proper divisors (246066126).

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

165666450 is a wasteful number, since it uses less digits than its factorization.

165666450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2379 (or 2374 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 165666450 is about 12871.1479674503. The cubic root of 165666450 is about 549.2181176496.

The spelling of 165666450 in words is "one hundred sixty-five million, six hundred sixty-six thousand, four hundred fifty".