66733437343649 has 2 divisors, whose sum is σ = 66733437343650. Its totient is φ = 66733437343648.

The previous prime is 66733437343633. The next prime is 66733437343687. The reversal of 66733437343649 is 94634373433766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47634291097600 + 19099146246049 = 6901760^2 + 4370257^2 .

It is a cyclic number.

It is not a de Polignac number, because 66733437343649 - 2⁴ = 66733437343633 is a prime.

It is not a weakly prime, because it can be changed into another prime (66733437343609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33366718671824 + 33366718671825.

It is an arithmetic number, because the mean of its divisors is an integer number (33366718671825).

Almost surely, 2^{66733437343649} is an apocalyptic number.

It is an amenable number.

66733437343649 is a deficient number, since it is larger than the sum of its proper divisors (1).

66733437343649 is an equidigital number, since it uses as much as digits as its factorization.

66733437343649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1481421312, while the sum is 68.

The spelling of 66733437343649 in words is "sixty-six trillion, seven hundred thirty-three billion, four hundred thirty-seven million, three hundred forty-three thousand, six hundred forty-nine".