66310399787 has 2 divisors, whose sum is σ = 66310399788. Its totient is φ = 66310399786.

The previous prime is 66310399747. The next prime is 66310399843. The reversal of 66310399787 is 78799301366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66310399787 - 2⁸ = 66310399531 is a prime.

It is not a weakly prime, because it can be changed into another prime (66310399747) 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, 33155199893 + 33155199894.

It is an arithmetic number, because the mean of its divisors is an integer number (33155199894).

Almost surely, 2^66310399787 is an apocalyptic number.

66310399787 is a deficient number, since it is larger than the sum of its proper divisors (1).

66310399787 is an equidigital number, since it uses as much as digits as its factorization.

66310399787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10287648, while the sum is 59.

The spelling of 66310399787 in words is "sixty-six billion, three hundred ten million, three hundred ninety-nine thousand, seven hundred eighty-seven".