66385263 has 32 divisors (see below), whose sum is σ = 106421760. Its totient is φ = 36005760.

The previous prime is 66385247. The next prime is 66385271. The reversal of 66385263 is 36258366.

It is a happy number.

It is not a de Polignac number, because 66385263 - 2⁴ = 66385247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66385223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36256 + ... + 38042.

It is an arithmetic number, because the mean of its divisors is an integer number (3325680).

Almost surely, 2^66385263 is an apocalyptic number.

66385263 is a deficient number, since it is larger than the sum of its proper divisors (40036497).

66385263 is a wasteful number, since it uses less digits than its factorization.

66385263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1887.

The product of its digits is 155520, while the sum is 39.

The square root of 66385263 is about 8147.7152012083. The cubic root of 66385263 is about 404.9088104402.

The spelling of 66385263 in words is "sixty-six million, three hundred eighty-five thousand, two hundred sixty-three".