66045431 has 2 divisors, whose sum is σ = 66045432. Its totient is φ = 66045430.

The previous prime is 66045403. The next prime is 66045487. The reversal of 66045431 is 13454066.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66045431 - 2¹⁸ = 65783287 is a prime.

It is a super-2 number, since 2×66045431² = 8723997911951522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66045394 and 66045403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66045401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33022715 + 33022716.

It is an arithmetic number, because the mean of its divisors is an integer number (33022716).

Almost surely, 2^66045431 is an apocalyptic number.

66045431 is a deficient number, since it is larger than the sum of its proper divisors (1).

66045431 is an equidigital number, since it uses as much as digits as its factorization.

66045431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 66045431 is about 8126.8340083947. The cubic root of 66045431 is about 404.2167068426.

Adding to 66045431 its reverse (13454066), we get a palindrome (79499497).

The spelling of 66045431 in words is "sixty-six million, forty-five thousand, four hundred thirty-one".