164158634623 has 4 divisors (see below), whose sum is σ = 164501346240. Its totient is φ = 163815923008.

The previous prime is 164158634567. The next prime is 164158634677. The reversal of 164158634623 is 326436851461.

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 164158634623 - 2²⁵ = 164125080191 is a prime.

It is a super-4 number, since 4×164158634623⁴ (a number of 46 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164158634683) 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, 171355090 + ... + 171356047.

It is an arithmetic number, because the mean of its divisors is an integer number (41125336560).

Almost surely, 2^164158634623 is an apocalyptic number.

164158634623 is a deficient number, since it is larger than the sum of its proper divisors (342711617).

164158634623 is an equidigital number, since it uses as much as digits as its factorization.

164158634623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342711616.

The product of its digits is 2488320, while the sum is 49.

The spelling of 164158634623 in words is "one hundred sixty-four billion, one hundred fifty-eight million, six hundred thirty-four thousand, six hundred twenty-three".