66077987 has 2 divisors, whose sum is σ = 66077988. Its totient is φ = 66077986.

The previous prime is 66077981. The next prime is 66078017. The reversal of 66077987 is 78977066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66077987 - 2⁶ = 66077923 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66077981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33038993 + 33038994.

It is an arithmetic number, because the mean of its divisors is an integer number (33038994).

Almost surely, 2^66077987 is an apocalyptic number.

66077987 is a deficient number, since it is larger than the sum of its proper divisors (1).

66077987 is an equidigital number, since it uses as much as digits as its factorization.

66077987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 889056, while the sum is 50.

The square root of 66077987 is about 8128.8367556496. The cubic root of 66077987 is about 404.2831132400.

The spelling of 66077987 in words is "sixty-six million, seventy-seven thousand, nine hundred eighty-seven".