665245251623 has 2 divisors, whose sum is σ = 665245251624. Its totient is φ = 665245251622.

The previous prime is 665245251613. The next prime is 665245251647. The reversal of 665245251623 is 326152542566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665245251623 - 2¹⁰ = 665245250599 is a prime.

It is a super-3 number, since 3×665245251623³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665245251613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332622625811 + 332622625812.

It is an arithmetic number, because the mean of its divisors is an integer number (332622625812).

Almost surely, 2^665245251623 is an apocalyptic number.

665245251623 is a deficient number, since it is larger than the sum of its proper divisors (1).

665245251623 is an equidigital number, since it uses as much as digits as its factorization.

665245251623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592000, while the sum is 47.

The spelling of 665245251623 in words is "six hundred sixty-five billion, two hundred forty-five million, two hundred fifty-one thousand, six hundred twenty-three".