164368639 has 4 divisors (see below), whose sum is σ = 173019640. Its totient is φ = 155717640.

The previous prime is 164368613. The next prime is 164368667. The reversal of 164368639 is 936863461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936863461 = 1993 ⋅470077.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164368639 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 (164368669) 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, 4325472 + ... + 4325509.

It is an arithmetic number, because the mean of its divisors is an integer number (43254910).

Almost surely, 2^164368639 is an apocalyptic number.

164368639 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

164368639 is a deficient number, since it is larger than the sum of its proper divisors (8651001).

164368639 is an equidigital number, since it uses as much as digits as its factorization.

164368639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8651000.

The product of its digits is 559872, while the sum is 46.

The square root of 164368639 is about 12820.6333306900. The cubic root of 164368639 is about 547.7801867175.

The spelling of 164368639 in words is "one hundred sixty-four million, three hundred sixty-eight thousand, six hundred thirty-nine".