165099923 has 4 divisors (see below), whose sum is σ = 165204648. Its totient is φ = 164995200.

The previous prime is 165099899. The next prime is 165099943. The reversal of 165099923 is 329990561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165099923 - 2¹⁸ = 164837779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165099943) 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, 49961 + ... + 53162.

It is an arithmetic number, because the mean of its divisors is an integer number (41301162).

Almost surely, 2^165099923 is an apocalyptic number.

165099923 is a deficient number, since it is larger than the sum of its proper divisors (104725).

165099923 is a wasteful number, since it uses less digits than its factorization.

165099923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104724.

The product of its (nonzero) digits is 131220, while the sum is 44.

The square root of 165099923 is about 12849.1214874792. The cubic root of 165099923 is about 548.5913517541.

The spelling of 165099923 in words is "one hundred sixty-five million, ninety-nine thousand, nine hundred twenty-three".