66423731 has 16 divisors (see below), whose sum is σ = 76640256. Its totient is φ = 57000000.

The previous prime is 66423719. The next prime is 66423739. The reversal of 66423731 is 13732466.

It is a cyclic number.

It is not a de Polignac number, because 66423731 - 2¹⁴ = 66407347 is a prime.

It is a super-2 number, since 2×66423731² = 8824224079920722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66423739) 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 15 ways as a sum of consecutive naturals, for example, 11606 + ... + 16356.

It is an arithmetic number, because the mean of its divisors is an integer number (4790016).

Almost surely, 2^66423731 is an apocalyptic number.

66423731 is a deficient number, since it is larger than the sum of its proper divisors (10216525).

66423731 is a wasteful number, since it uses less digits than its factorization.

66423731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4834.

The product of its digits is 18144, while the sum is 32.

The square root of 66423731 is about 8150.0755211225. The cubic root of 66423731 is about 404.9870056289.

The spelling of 66423731 in words is "sixty-six million, four hundred twenty-three thousand, seven hundred thirty-one".