66859000693 has 2 divisors, whose sum is σ = 66859000694. Its totient is φ = 66859000692.

The previous prime is 66859000639. The next prime is 66859000717. The reversal of 66859000693 is 39600095866.

It is a happy number.

Together with previous prime (66859000639) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64446422769 + 2412577924 = 253863^2 + 49118^2 .

It is a cyclic number.

It is not a de Polignac number, because 66859000693 - 2²⁹ = 66322129781 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66859000693.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66859000993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33429500346 + 33429500347.

It is an arithmetic number, because the mean of its divisors is an integer number (33429500347).

Almost surely, 2^66859000693 is an apocalyptic number.

It is an amenable number.

66859000693 is a deficient number, since it is larger than the sum of its proper divisors (1).

66859000693 is an equidigital number, since it uses as much as digits as its factorization.

66859000693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2099520, while the sum is 52.

The spelling of 66859000693 in words is "sixty-six billion, eight hundred fifty-nine million, six hundred ninety-three", and thus it is an aban number.