164618623 has 4 divisors (see below), whose sum is σ = 177281608. Its totient is φ = 151955640.

The previous prime is 164618621. The next prime is 164618693. The reversal of 164618623 is 326816461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326816461 = 4729 ⋅69109.

It is a cyclic number.

It is not a de Polignac number, because 164618623 - 2¹ = 164618621 is a prime.

It is a super-2 number, since 2×164618623² = 54198582076832258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164618621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6331473 + ... + 6331498.

It is an arithmetic number, because the mean of its divisors is an integer number (44320402).

Almost surely, 2^164618623 is an apocalyptic number.

164618623 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

164618623 is a deficient number, since it is larger than the sum of its proper divisors (12662985).

164618623 is a wasteful number, since it uses less digits than its factorization.

164618623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12662984.

The product of its digits is 41472, while the sum is 37.

The square root of 164618623 is about 12830.3789110065. The cubic root of 164618623 is about 548.0577476129.

The spelling of 164618623 in words is "one hundred sixty-four million, six hundred eighteen thousand, six hundred twenty-three".