665431315503 has 32 divisors (see below), whose sum is σ = 941513740992. Its totient is φ = 416601292800.

The previous prime is 665431315501. The next prime is 665431315609. The reversal of 665431315503 is 305513134566.

It is a happy number.

It is not a de Polignac number, because 665431315503 - 2¹ = 665431315501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665431315501) 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, 72003963 + ... + 72013203.

It is an arithmetic number, because the mean of its divisors is an integer number (29422304406).

Almost surely, 2^665431315503 is an apocalyptic number.

665431315503 is a deficient number, since it is larger than the sum of its proper divisors (276082425489).

665431315503 is a wasteful number, since it uses less digits than its factorization.

665431315503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12235.

The product of its (nonzero) digits is 486000, while the sum is 42.

The spelling of 665431315503 in words is "six hundred sixty-five billion, four hundred thirty-one million, three hundred fifteen thousand, five hundred three".