66831933215777 has 2 divisors, whose sum is σ = 66831933215778. Its totient is φ = 66831933215776.

The previous prime is 66831933215759. The next prime is 66831933215797. The reversal of 66831933215777 is 77751233913866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47012840141281 + 19819093074496 = 6856591^2 + 4451864^2 .

It is a cyclic number.

It is not a de Polignac number, because 66831933215777 - 2⁶ = 66831933215713 is a prime.

It is not a weakly prime, because it can be changed into another prime (66831933215797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33415966607888 + 33415966607889.

It is an arithmetic number, because the mean of its divisors is an integer number (33415966607889).

Almost surely, 2^{66831933215777} is an apocalyptic number.

It is an amenable number.

66831933215777 is a deficient number, since it is larger than the sum of its proper divisors (1).

66831933215777 is an equidigital number, since it uses as much as digits as its factorization.

66831933215777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240045120, while the sum is 68.

The spelling of 66831933215777 in words is "sixty-six trillion, eight hundred thirty-one billion, nine hundred thirty-three million, two hundred fifteen thousand, seven hundred seventy-seven".