66912887 has 2 divisors, whose sum is σ = 66912888. Its totient is φ = 66912886.

The previous prime is 66912877. The next prime is 66912899. The reversal of 66912887 is 78821966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66912887 - 2¹² = 66908791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66912847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33456443 + 33456444.

It is an arithmetic number, because the mean of its divisors is an integer number (33456444).

Almost surely, 2^66912887 is an apocalyptic number.

66912887 is a deficient number, since it is larger than the sum of its proper divisors (1).

66912887 is an equidigital number, since it uses as much as digits as its factorization.

66912887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 47.

The square root of 66912887 is about 8180.0297676720. The cubic root of 66912887 is about 405.9787070134.

The spelling of 66912887 in words is "sixty-six million, nine hundred twelve thousand, eight hundred eighty-seven".