66666594077 has 2 divisors, whose sum is σ = 66666594078. Its totient is φ = 66666594076.

The previous prime is 66666594019. The next prime is 66666594149. The reversal of 66666594077 is 77049566666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64064165881 + 2602428196 = 253109^2 + 51014^2 .

It is a cyclic number.

It is not a de Polignac number, because 66666594077 - 2⁶ = 66666594013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66666594277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33333297038 + 33333297039.

It is an arithmetic number, because the mean of its divisors is an integer number (33333297039).

Almost surely, 2^66666594077 is an apocalyptic number.

It is an amenable number.

66666594077 is a deficient number, since it is larger than the sum of its proper divisors (1).

66666594077 is an equidigital number, since it uses as much as digits as its factorization.

66666594077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68584320, while the sum is 62.

The spelling of 66666594077 in words is "sixty-six billion, six hundred sixty-six million, five hundred ninety-four thousand, seventy-seven".