666666666733 has 2 divisors, whose sum is σ = 666666666734. Its totient is φ = 666666666732.

The previous prime is 666666666671. The next prime is 666666666739. The reversal of 666666666733 is 337666666666.

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., 620184600324 + 46482066409 = 787518^2 + 215597^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666666666733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666666666739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333333333366 + 333333333367.

It is an arithmetic number, because the mean of its divisors is an integer number (333333333367).

Almost surely, 2^666666666733 is an apocalyptic number.

It is an amenable number.

666666666733 is a deficient number, since it is larger than the sum of its proper divisors (1).

666666666733 is an equidigital number, since it uses as much as digits as its factorization.

666666666733 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 634894848, while the sum is 67.

Subtracting from 666666666733 its sum of digits (67), we obtain a palindrome (666666666666).

The spelling of 666666666733 in words is "six hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, seven hundred thirty-three".