165666053 has 4 divisors (see below), whose sum is σ = 189332640. Its totient is φ = 141999468.

The previous prime is 165666047. The next prime is 165666089. The reversal of 165666053 is 350666561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 350666561 = 7 ⋅50095223.

It is a cyclic number.

It is not a de Polignac number, because 165666053 - 2²² = 161471749 is a prime.

It is a super-2 number, since 2×165666053² = 54890482233197618, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 165665998 and 165666016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165666013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11833283 + ... + 11833296.

It is an arithmetic number, because the mean of its divisors is an integer number (47333160).

Almost surely, 2^165666053 is an apocalyptic number.

It is an amenable number.

165666053 is a deficient number, since it is larger than the sum of its proper divisors (23666587).

165666053 is an equidigital number, since it uses as much as digits as its factorization.

165666053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23666586.

The product of its (nonzero) digits is 97200, while the sum is 38.

The square root of 165666053 is about 12871.1325453512. The cubic root of 165666053 is about 549.2176789372.

The spelling of 165666053 in words is "one hundred sixty-five million, six hundred sixty-six thousand, fifty-three".