164642623 has 4 divisors (see below), whose sum is σ = 164668840. Its totient is φ = 164616408.

The previous prime is 164642617. The next prime is 164642629. The reversal of 164642623 is 326246461.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (164642617) and next prime (164642629).

It is a cyclic number.

It is not a de Polignac number, because 164642623 - 2⁵ = 164642591 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 (164642629) 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, 2536 + ... + 18322.

It is an arithmetic number, because the mean of its divisors is an integer number (41167210).

Almost surely, 2^164642623 is an apocalyptic number.

164642623 is a deficient number, since it is larger than the sum of its proper divisors (26217).

164642623 is a wasteful number, since it uses less digits than its factorization.

164642623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26216.

The product of its digits is 41472, while the sum is 34.

The square root of 164642623 is about 12831.3141571703. The cubic root of 164642623 is about 548.0843803768.

The spelling of 164642623 in words is "one hundred sixty-four million, six hundred forty-two thousand, six hundred twenty-three".