666431103 has 32 divisors (see below), whose sum is σ = 970776576. Its totient is φ = 404224128.

The previous prime is 666431081. The next prime is 666431147. The reversal of 666431103 is 301134666.

It is a de Polignac number, because none of the positive numbers 2^k-666431103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666431303) 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, 975400 + ... + 976082.

It is an arithmetic number, because the mean of its divisors is an integer number (30336768).

Almost surely, 2^666431103 is an apocalyptic number.

666431103 is a deficient number, since it is larger than the sum of its proper divisors (304345473).

666431103 is a wasteful number, since it uses less digits than its factorization.

666431103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 666431103 is about 25815.3269008936. The cubic root of 666431103 is about 873.4775607064.

Adding to 666431103 its reverse (301134666), we get a palindrome (967565769).

The spelling of 666431103 in words is "six hundred sixty-six million, four hundred thirty-one thousand, one hundred three".