66077887 has 2 divisors, whose sum is σ = 66077888. Its totient is φ = 66077886.

The previous prime is 66077867. The next prime is 66077897. The reversal of 66077887 is 78877066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66077887 - 2¹⁹ = 65553599 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66077887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66077857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33038943 + 33038944.

It is an arithmetic number, because the mean of its divisors is an integer number (33038944).

Almost surely, 2^66077887 is an apocalyptic number.

66077887 is a deficient number, since it is larger than the sum of its proper divisors (1).

66077887 is an equidigital number, since it uses as much as digits as its factorization.

66077887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 790272, while the sum is 49.

The square root of 66077887 is about 8128.8306047057. The cubic root of 66077887 is about 404.2829092975.

The spelling of 66077887 in words is "sixty-six million, seventy-seven thousand, eight hundred eighty-seven".