164937776639 has 4 divisors (see below), whose sum is σ = 169395554424. Its totient is φ = 160479998856.

The previous prime is 164937776629. The next prime is 164937776681. The reversal of 164937776639 is 936677739461.

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 164937776639 - 2²⁰ = 164936728063 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 (164937776629) 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, 2228888837 + ... + 2228888910.

It is an arithmetic number, because the mean of its divisors is an integer number (42348888606).

Almost surely, 2^164937776639 is an apocalyptic number.

164937776639 is a deficient number, since it is larger than the sum of its proper divisors (4457777785).

164937776639 is an equidigital number, since it uses as much as digits as its factorization.

164937776639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4457777784.

The product of its digits is 216040608, while the sum is 68.

The spelling of 164937776639 in words is "one hundred sixty-four billion, nine hundred thirty-seven million, seven hundred seventy-six thousand, six hundred thirty-nine".