66066061987 has 2 divisors, whose sum is σ = 66066061988. Its totient is φ = 66066061986.

The previous prime is 66066061979. The next prime is 66066062053. The reversal of 66066061987 is 78916066066.

66066061987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66066061987 - 2³ = 66066061979 is a prime.

It is not a weakly prime, because it can be changed into another prime (66066061687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33033030993 + 33033030994.

It is an arithmetic number, because the mean of its divisors is an integer number (33033030994).

Almost surely, 2^66066061987 is an apocalyptic number.

66066061987 is a deficient number, since it is larger than the sum of its proper divisors (1).

66066061987 is an equidigital number, since it uses as much as digits as its factorization.

66066061987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3919104, while the sum is 55.

The spelling of 66066061987 in words is "sixty-six billion, sixty-six million, sixty-one thousand, nine hundred eighty-seven".