164166869 has 2 divisors, whose sum is σ = 164166870. Its totient is φ = 164166868.

The previous prime is 164166833. The next prime is 164166881. The reversal of 164166869 is 968661461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138532900 + 25633969 = 11770^2 + 5063^2 .

It is an emirp because it is prime and its reverse (968661461) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164166869 is a prime.

It is a super-2 number, since 2×164166869² = 53901521754526322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164166469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82083434 + 82083435.

It is an arithmetic number, because the mean of its divisors is an integer number (82083435).

Almost surely, 2^164166869 is an apocalyptic number.

It is an amenable number.

164166869 is a deficient number, since it is larger than the sum of its proper divisors (1).

164166869 is an equidigital number, since it uses as much as digits as its factorization.

164166869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 47.

The square root of 164166869 is about 12812.7619582977. The cubic root of 164166869 is about 547.5559532204. Note that the first 3 decimals are identical.

The spelling of 164166869 in words is "one hundred sixty-four million, one hundred sixty-six thousand, eight hundred sixty-nine".