66680674787 has 2 divisors, whose sum is σ = 66680674788. Its totient is φ = 66680674786.

The previous prime is 66680674783. The next prime is 66680674813. The reversal of 66680674787 is 78747608666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66680674787 - 2² = 66680674783 is a prime.

It is not a weakly prime, because it can be changed into another prime (66680674783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33340337393 + 33340337394.

It is an arithmetic number, because the mean of its divisors is an integer number (33340337394).

Almost surely, 2^66680674787 is an apocalyptic number.

66680674787 is a deficient number, since it is larger than the sum of its proper divisors (1).

66680674787 is an equidigital number, since it uses as much as digits as its factorization.

66680674787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 113799168, while the sum is 65.

The spelling of 66680674787 in words is "sixty-six billion, six hundred eighty million, six hundred seventy-four thousand, seven hundred eighty-seven".