66321303493 has 2 divisors, whose sum is σ = 66321303494. Its totient is φ = 66321303492.

The previous prime is 66321303487. The next prime is 66321303541. The reversal of 66321303493 is 39430312366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59332677889 + 6988625604 = 243583^2 + 83598^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66321303493 is a prime.

It is a super-2 number, since 2×66321303493² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66321303473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33160651746 + 33160651747.

It is an arithmetic number, because the mean of its divisors is an integer number (33160651747).

Almost surely, 2^66321303493 is an apocalyptic number.

It is an amenable number.

66321303493 is a deficient number, since it is larger than the sum of its proper divisors (1).

66321303493 is an equidigital number, since it uses as much as digits as its factorization.

66321303493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 40.

The spelling of 66321303493 in words is "sixty-six billion, three hundred twenty-one million, three hundred three thousand, four hundred ninety-three".