165172423 has 4 divisors (see below), whose sum is σ = 177878008. Its totient is φ = 152466840.

The previous prime is 165172379. The next prime is 165172451. The reversal of 165172423 is 324271561.

165172423 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 165172423 - 2¹⁷ = 165041351 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 (165172463) 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, 6352773 + ... + 6352798.

It is an arithmetic number, because the mean of its divisors is an integer number (44469502).

Almost surely, 2^165172423 is an apocalyptic number.

165172423 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

165172423 is a deficient number, since it is larger than the sum of its proper divisors (12705585).

165172423 is a wasteful number, since it uses less digits than its factorization.

165172423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12705584.

The product of its digits is 10080, while the sum is 31.

The square root of 165172423 is about 12851.9423823794. The cubic root of 165172423 is about 548.6716406117.

The spelling of 165172423 in words is "one hundred sixty-five million, one hundred seventy-two thousand, four hundred twenty-three".