66327431 has 2 divisors, whose sum is σ = 66327432. Its totient is φ = 66327430.

The previous prime is 66327427. The next prime is 66327439. The reversal of 66327431 is 13472366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66327431 - 2² = 66327427 is a prime.

It is a super-2 number, since 2×66327431² = 8798656206119522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66327439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33163715 + 33163716.

It is an arithmetic number, because the mean of its divisors is an integer number (33163716).

Almost surely, 2^66327431 is an apocalyptic number.

66327431 is a deficient number, since it is larger than the sum of its proper divisors (1).

66327431 is an equidigital number, since it uses as much as digits as its factorization.

66327431 is an evil number, because the sum of its binary digits is even.

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

The square root of 66327431 is about 8144.1654575530. The cubic root of 66327431 is about 404.7911965380.

Adding to 66327431 its reverse (13472366), we get a palindrome (79799797).

The spelling of 66327431 in words is "sixty-six million, three hundred twenty-seven thousand, four hundred thirty-one".