165166623 has 6 divisors (see below), whose sum is σ = 238574024. Its totient is φ = 110111076.

The previous prime is 165166559. The next prime is 165166633. The reversal of 165166623 is 326661561.

It is not a de Polignac number, because 165166623 - 2⁶ = 165166559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165166633) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9175915 + ... + 9175932.

Almost surely, 2^165166623 is an apocalyptic number.

165166623 is a deficient number, since it is larger than the sum of its proper divisors (73407401).

165166623 is a wasteful number, since it uses less digits than its factorization.

165166623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18351853 (or 18351850 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 165166623 is about 12851.7167335730. The cubic root of 165166623 is about 548.6652183678.

The spelling of 165166623 in words is "one hundred sixty-five million, one hundred sixty-six thousand, six hundred twenty-three".