66668888668933 has 2 divisors, whose sum is σ = 66668888668934. Its totient is φ = 66668888668932.

The previous prime is 66668888668873. The next prime is 66668888668937. The reversal of 66668888668933 is 33986688886666.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46876506676164 + 19792381992769 = 6846642^2 + 4448863^2 .

It is a cyclic number.

It is not a de Polignac number, because 66668888668933 - 2¹⁷ = 66668888537861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66668888668937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33334444334466 + 33334444334467.

It is an arithmetic number, because the mean of its divisors is an integer number (33334444334467).

Almost surely, 2^{66668888668933} is an apocalyptic number.

It is an amenable number.

66668888668933 is a deficient number, since it is larger than the sum of its proper divisors (1).

66668888668933 is an equidigital number, since it uses as much as digits as its factorization.

66668888668933 is an evil number, because the sum of its binary digits is even.

The product of its digits is 123834728448, while the sum is 91.

The spelling of 66668888668933 in words is "sixty-six trillion, six hundred sixty-eight billion, eight hundred eighty-eight million, six hundred sixty-eight thousand, nine hundred thirty-three".