665349943603 has 2 divisors, whose sum is σ = 665349943604. Its totient is φ = 665349943602.

The previous prime is 665349943561. The next prime is 665349943627. The reversal of 665349943603 is 306349943566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665349943603 - 2⁹ = 665349943091 is a prime.

It is a super-3 number, since 3×665349943603³ (a number of 36 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (665349943403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332674971801 + 332674971802.

It is an arithmetic number, because the mean of its divisors is an integer number (332674971802).

Almost surely, 2^665349943603 is an apocalyptic number.

665349943603 is a deficient number, since it is larger than the sum of its proper divisors (1).

665349943603 is an equidigital number, since it uses as much as digits as its factorization.

665349943603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37791360, while the sum is 58.

The spelling of 665349943603 in words is "six hundred sixty-five billion, three hundred forty-nine million, nine hundred forty-three thousand, six hundred three".