66275989 has 4 divisors (see below), whose sum is σ = 71374156. Its totient is φ = 61177824.

The previous prime is 66275987. The next prime is 66275999. The reversal of 66275989 is 98957266.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32832900 + 33443089 = 5730^2 + 5783^2 .

It is a cyclic number.

It is not a de Polignac number, because 66275989 - 2¹ = 66275987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66275983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2549064 + ... + 2549089.

It is an arithmetic number, because the mean of its divisors is an integer number (17843539).

Almost surely, 2^66275989 is an apocalyptic number.

It is an amenable number.

66275989 is a deficient number, since it is larger than the sum of its proper divisors (5098167).

66275989 is a wasteful number, since it uses less digits than its factorization.

66275989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5098166.

The product of its digits is 1632960, while the sum is 52.

The square root of 66275989 is about 8141.0066330891. The cubic root of 66275989 is about 404.6865206190.

The spelling of 66275989 in words is "sixty-six million, two hundred seventy-five thousand, nine hundred eighty-nine".