164421769 has 4 divisors (see below), whose sum is σ = 166674196. Its totient is φ = 162169344.

The previous prime is 164421749. The next prime is 164421797. The reversal of 164421769 is 967124461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63680400 + 100741369 = 7980^2 + 10037^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164421769 is a prime.

It is a super-3 number, since 3×164421769³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164421709) 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, 1126104 + ... + 1126249.

It is an arithmetic number, because the mean of its divisors is an integer number (41668549).

Almost surely, 2^164421769 is an apocalyptic number.

It is an amenable number.

164421769 is a deficient number, since it is larger than the sum of its proper divisors (2252427).

164421769 is an equidigital number, since it uses as much as digits as its factorization.

164421769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2252426.

The product of its digits is 72576, while the sum is 40.

The square root of 164421769 is about 12822.7052137995. The cubic root of 164421769 is about 547.8392012722.

The spelling of 164421769 in words is "one hundred sixty-four million, four hundred twenty-one thousand, seven hundred sixty-nine".