164138779 has 6 divisors (see below), whose sum is σ = 190937004. Its totient is φ = 140690340.

The previous prime is 164138773. The next prime is 164138797. The reversal of 164138779 is 977831461.

164138779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 164138779 - 2⁷ = 164138651 is a prime.

It is a super-2 number, since 2×164138779² = 53883077543221682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164138773) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1674837 + ... + 1674934.

It is an arithmetic number, because the mean of its divisors is an integer number (31822834).

Almost surely, 2^164138779 is an apocalyptic number.

164138779 is a deficient number, since it is larger than the sum of its proper divisors (26798225).

164138779 is an equidigital number, since it uses as much as digits as its factorization.

164138779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3349785 (or 3349778 counting only the distinct ones).

The product of its digits is 254016, while the sum is 46.

The square root of 164138779 is about 12811.6657386930. The cubic root of 164138779 is about 547.5247213318.

The spelling of 164138779 in words is "one hundred sixty-four million, one hundred thirty-eight thousand, seven hundred seventy-nine".