66370253 has 4 divisors (see below), whose sum is σ = 66386880. Its totient is φ = 66353628.

The previous prime is 66370247. The next prime is 66370259. The reversal of 66370253 is 35207366.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 35207366 = 2 ⋅17603683.

It is an interprime number because it is at equal distance from previous prime (66370247) and next prime (66370259).

It is a cyclic number.

It is not a de Polignac number, because 66370253 - 2¹⁶ = 66304717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66370259) 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, 1676 + ... + 11642.

It is an arithmetic number, because the mean of its divisors is an integer number (16596720).

Almost surely, 2^66370253 is an apocalyptic number.

It is an amenable number.

66370253 is a deficient number, since it is larger than the sum of its proper divisors (16627).

66370253 is an equidigital number, since it uses as much as digits as its factorization.

66370253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16626.

The product of its (nonzero) digits is 22680, while the sum is 32.

The square root of 66370253 is about 8146.7940320104. The cubic root of 66370253 is about 404.8782909188.

The spelling of 66370253 in words is "sixty-six million, three hundred seventy thousand, two hundred fifty-three".