66277989 has 12 divisors (see below), whose sum is σ = 98322796. Its totient is φ = 42990912.

The previous prime is 66277979. The next prime is 66277999. The reversal of 66277989 is 98977266.

66277989 is a `hidden beast` number, since 6 + 627 + 7 + 9 + 8 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (66277979) and next prime (66277999).

It can be written as a sum of positive squares in 2 ways, for example, as 41177889 + 25100100 = 6417^2 + 5010^2 .

It is not a de Polignac number, because 66277989 - 2⁵ = 66277957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66277979) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99184 + ... + 99849.

Almost surely, 2^66277989 is an apocalyptic number.

It is an amenable number.

66277989 is a deficient number, since it is larger than the sum of its proper divisors (32044807).

66277989 is a wasteful number, since it uses less digits than its factorization.

66277989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199076 (or 199073 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 66277989 is about 8141.1294670948. The cubic root of 66277989 is about 404.6905912983.

The spelling of 66277989 in words is "sixty-six million, two hundred seventy-seven thousand, nine hundred eighty-nine".