665603464831 has 2 divisors, whose sum is σ = 665603464832. Its totient is φ = 665603464830.

The previous prime is 665603464819. The next prime is 665603464853. The reversal of 665603464831 is 138464306566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665603464831 - 2¹⁵ = 665603432063 is a prime.

It is a super-2 number, since 2×665603464831² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665603464811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332801732415 + 332801732416.

It is an arithmetic number, because the mean of its divisors is an integer number (332801732416).

Almost surely, 2^665603464831 is an apocalyptic number.

665603464831 is a deficient number, since it is larger than the sum of its proper divisors (1).

665603464831 is an equidigital number, since it uses as much as digits as its factorization.

665603464831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7464960, while the sum is 52.

The spelling of 665603464831 in words is "six hundred sixty-five billion, six hundred three million, four hundred sixty-four thousand, eight hundred thirty-one".