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66666666697 is a prime number
BaseRepresentation
bin111110000101101001…
…001001101011001001
320101002010002120012121
4332011221021223021
52043013131313242
650343134011241
74550030213521
oct760551115311
9211063076177
1066666666697
1126300660464
1210b06646b21
136395994097
143326040681
151b02b76667
hexf85a49ac9

66666666697 has 2 divisors, whose sum is σ = 66666666698. Its totient is φ = 66666666696.

The previous prime is 66666666667. The next prime is 66666666709. The reversal of 66666666697 is 79666666666.

66666666697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61430118201 + 5236548496 = 247851^2 + 72364^2 .

It is a cyclic number.

It is not a de Polignac number, because 66666666697 - 219 = 66666142409 is a prime.

It is not a weakly prime, because it can be changed into another prime (66666666667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33333333348 + 33333333349.

It is an arithmetic number, because the mean of its divisors is an integer number (33333333349).

Almost surely, 266666666697 is an apocalyptic number.

It is an amenable number.

66666666697 is a deficient number, since it is larger than the sum of its proper divisors (1).

66666666697 is an equidigital number, since it uses as much as digits as its factorization.

66666666697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 634894848, while the sum is 70.

The spelling of 66666666697 in words is "sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred ninety-seven".