665433021683 has 2 divisors, whose sum is σ = 665433021684. Its totient is φ = 665433021682.

The previous prime is 665433021637. The next prime is 665433021689. The reversal of 665433021683 is 386120334566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665433021683 - 2³⁴ = 648253152499 is a prime.

It is a super-2 number, since 2×665433021683² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (665433021689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332716510841 + 332716510842.

It is an arithmetic number, because the mean of its divisors is an integer number (332716510842).

Almost surely, 2^665433021683 is an apocalyptic number.

665433021683 is a deficient number, since it is larger than the sum of its proper divisors (1).

665433021683 is an equidigital number, since it uses as much as digits as its factorization.

665433021683 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1866240, while the sum is 47.

The spelling of 665433021683 in words is "six hundred sixty-five billion, four hundred thirty-three million, twenty-one thousand, six hundred eighty-three".