6665324458021 has 2 divisors, whose sum is σ = 6665324458022. Its totient is φ = 6665324458020.

The previous prime is 6665324457941. The next prime is 6665324458103. The reversal of 6665324458021 is 1208544235666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6491723068996 + 173601389025 = 2547886^2 + 416655^2 .

It is a cyclic number.

It is not a de Polignac number, because 6665324458021 - 2²¹ = 6665322360869 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6665324458021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6665324452021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332662229010 + 3332662229011.

It is an arithmetic number, because the mean of its divisors is an integer number (3332662229011).

Almost surely, 2^{6665324458021} is an apocalyptic number.

It is an amenable number.

6665324458021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6665324458021 is an equidigital number, since it uses as much as digits as its factorization.

6665324458021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8294400, while the sum is 52.

The spelling of 6665324458021 in words is "six trillion, six hundred sixty-five billion, three hundred twenty-four million, four hundred fifty-eight thousand, twenty-one".