66164249 has 4 divisors (see below), whose sum is σ = 66180660. Its totient is φ = 66147840.

The previous prime is 66164243. The next prime is 66164257. The reversal of 66164249 is 94246166.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 51380224 + 14784025 = 7168^2 + 3845^2 .

It is a cyclic number.

It is not a de Polignac number, because 66164249 - 2¹² = 66160153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66164243) 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, 2489 + ... + 11769.

It is an arithmetic number, because the mean of its divisors is an integer number (16545165).

Almost surely, 2^66164249 is an apocalyptic number.

It is an amenable number.

66164249 is a deficient number, since it is larger than the sum of its proper divisors (16411).

66164249 is an equidigital number, since it uses as much as digits as its factorization.

66164249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16410.

The product of its digits is 62208, while the sum is 38.

The square root of 66164249 is about 8134.1409503401. The cubic root of 66164249 is about 404.4589615412.

The spelling of 66164249 in words is "sixty-six million, one hundred sixty-four thousand, two hundred forty-nine".