66004987 has 2 divisors, whose sum is σ = 66004988. Its totient is φ = 66004986.

The previous prime is 66004979. The next prime is 66005021. The reversal of 66004987 is 78940066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66004987 - 2³ = 66004979 is a prime.

It is not a weakly prime, because it can be changed into another prime (66004787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33002493 + 33002494.

It is an arithmetic number, because the mean of its divisors is an integer number (33002494).

Almost surely, 2^66004987 is an apocalyptic number.

66004987 is a deficient number, since it is larger than the sum of its proper divisors (1).

66004987 is an equidigital number, since it uses as much as digits as its factorization.

66004987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 66004987 is about 8124.3453274710. The cubic root of 66004987 is about 404.1341804240.

The spelling of 66004987 in words is "sixty-six million, four thousand, nine hundred eighty-seven".