665433357623 has 2 divisors, whose sum is σ = 665433357624. Its totient is φ = 665433357622.

The previous prime is 665433357619. The next prime is 665433357683. The reversal of 665433357623 is 326753334566.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665433357623 - 2² = 665433357619 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665433357683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332716678811 + 332716678812.

It is an arithmetic number, because the mean of its divisors is an integer number (332716678812).

Almost surely, 2^665433357623 is an apocalyptic number.

665433357623 is a deficient number, since it is larger than the sum of its proper divisors (1).

665433357623 is an equidigital number, since it uses as much as digits as its factorization.

665433357623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24494400, while the sum is 53.

The spelling of 665433357623 in words is "six hundred sixty-five billion, four hundred thirty-three million, three hundred fifty-seven thousand, six hundred twenty-three".