66433431 has 16 divisors (see below), whose sum is σ = 90126080. Its totient is φ = 43519680.

The previous prime is 66433397. The next prime is 66433447. The reversal of 66433431 is 13433466.

It is not a de Polignac number, because 66433431 - 2⁷ = 66433303 is a prime.

It is a super-2 number, since 2×66433431² = 8826801508863522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66433531) 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, 95796 + ... + 96486.

It is an arithmetic number, because the mean of its divisors is an integer number (5632880).

Almost surely, 2^66433431 is an apocalyptic number.

66433431 is a deficient number, since it is larger than the sum of its proper divisors (23692649).

66433431 is a wasteful number, since it uses less digits than its factorization.

66433431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1206.

The product of its digits is 15552, while the sum is 30.

The square root of 66433431 is about 8150.6705859089. The cubic root of 66433431 is about 405.0067183766.

Adding to 66433431 its reverse (13433466), we get a palindrome (79866897).

The spelling of 66433431 in words is "sixty-six million, four hundred thirty-three thousand, four hundred thirty-one".