165613623 has 8 divisors (see below), whose sum is σ = 252363648. Its totient is φ = 94636344.

The previous prime is 165613607. The next prime is 165613661. The reversal of 165613623 is 326316561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165613623 - 2⁴ = 165613607 is a prime.

It is a super-2 number, since 2×165613623² = 54855744246372258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165613223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3943161 + ... + 3943202.

It is an arithmetic number, because the mean of its divisors is an integer number (31545456).

Almost surely, 2^165613623 is an apocalyptic number.

165613623 is a deficient number, since it is larger than the sum of its proper divisors (86750025).

165613623 is an equidigital number, since it uses as much as digits as its factorization.

165613623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7886373.

The product of its digits is 19440, while the sum is 33.

The square root of 165613623 is about 12869.0956558726. The cubic root of 165613623 is about 549.1597340119.

The spelling of 165613623 in words is "one hundred sixty-five million, six hundred thirteen thousand, six hundred twenty-three".