66786697577 has 2 divisors, whose sum is σ = 66786697578. Its totient is φ = 66786697576.

The previous prime is 66786697541. The next prime is 66786697613. The reversal of 66786697577 is 77579668766.

It is a balanced prime because it is at equal distance from previous prime (66786697541) and next prime (66786697613).

It can be written as a sum of positive squares in only one way, i.e., 64900619536 + 1886078041 = 254756^2 + 43429^2 .

It is a cyclic number.

It is not a de Polignac number, because 66786697577 - 2¹⁴ = 66786681193 is a prime.

It is not a weakly prime, because it can be changed into another prime (66786697177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33393348788 + 33393348789.

It is an arithmetic number, because the mean of its divisors is an integer number (33393348789).

Almost surely, 2^66786697577 is an apocalyptic number.

It is an amenable number.

66786697577 is a deficient number, since it is larger than the sum of its proper divisors (1).

66786697577 is an equidigital number, since it uses as much as digits as its factorization.

66786697577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1120210560, while the sum is 74.

The spelling of 66786697577 in words is "sixty-six billion, seven hundred eighty-six million, six hundred ninety-seven thousand, five hundred seventy-seven".