66724263 has 32 divisors (see below), whose sum is σ = 101528000. Its totient is φ = 43296768.

The previous prime is 66724243. The next prime is 66724267. The reversal of 66724263 is 36242766.

It is a happy number.

It is not a de Polignac number, because 66724263 - 2⁶ = 66724199 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66724267) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 191013 + ... + 191361.

It is an arithmetic number, because the mean of its divisors is an integer number (3172750).

Almost surely, 2^66724263 is an apocalyptic number.

66724263 is a deficient number, since it is larger than the sum of its proper divisors (34803737).

66724263 is a wasteful number, since it uses less digits than its factorization.

66724263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528 (or 522 counting only the distinct ones).

The product of its digits is 72576, while the sum is 36.

The square root of 66724263 is about 8168.4920885069. The cubic root of 66724263 is about 405.5968702710.

The spelling of 66724263 in words is "sixty-six million, seven hundred twenty-four thousand, two hundred sixty-three".