66641362643 has 2 divisors, whose sum is σ = 66641362644. Its totient is φ = 66641362642.

The previous prime is 66641362631. The next prime is 66641362681. The reversal of 66641362643 is 34626314666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66641362643 - 2¹⁴ = 66641346259 is a prime.

It is not a weakly prime, because it can be changed into another prime (66641362693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33320681321 + 33320681322.

It is an arithmetic number, because the mean of its divisors is an integer number (33320681322).

Almost surely, 2^66641362643 is an apocalyptic number.

66641362643 is a deficient number, since it is larger than the sum of its proper divisors (1).

66641362643 is an equidigital number, since it uses as much as digits as its factorization.

66641362643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2239488, while the sum is 47.

The spelling of 66641362643 in words is "sixty-six billion, six hundred forty-one million, three hundred sixty-two thousand, six hundred forty-three".