164065943849 has 4 divisors (see below), whose sum is σ = 164067221136. Its totient is φ = 164064666564.

The previous prime is 164065943837. The next prime is 164065943963. The reversal of 164065943849 is 948349560461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 948349560461 = 167 ⋅5678739883.

It is a cyclic number.

It is not a de Polignac number, because 164065943849 - 2²⁸ = 163797508393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164065943449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 421319 + ... + 711084.

It is an arithmetic number, because the mean of its divisors is an integer number (41016805284).

Almost surely, 2^164065943849 is an apocalyptic number.

It is an amenable number.

164065943849 is a deficient number, since it is larger than the sum of its proper divisors (1277287).

164065943849 is a wasteful number, since it uses less digits than its factorization.

164065943849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1277286.

The product of its (nonzero) digits is 22394880, while the sum is 59.

The spelling of 164065943849 in words is "one hundred sixty-four billion, sixty-five million, nine hundred forty-three thousand, eight hundred forty-nine".