66957089 has 4 divisors (see below), whose sum is σ = 67006020. Its totient is φ = 66908160.

The previous prime is 66957061. The next prime is 66957097. The reversal of 66957089 is 98075966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98075966 = 2 ⋅49037983.

It can be written as a sum of positive squares in 2 ways, for example, as 26214400 + 40742689 = 5120^2 + 6383^2 .

It is a cyclic number.

It is not a de Polignac number, because 66957089 - 2²⁴ = 50179873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66957019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22352 + ... + 25169.

It is an arithmetic number, because the mean of its divisors is an integer number (16751505).

Almost surely, 2^66957089 is an apocalyptic number.

It is an amenable number.

66957089 is a deficient number, since it is larger than the sum of its proper divisors (48931).

66957089 is a wasteful number, since it uses less digits than its factorization.

66957089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48930.

The product of its (nonzero) digits is 816480, while the sum is 50.

The square root of 66957089 is about 8182.7311455284. The cubic root of 66957089 is about 406.0680825264.

The spelling of 66957089 in words is "sixty-six million, nine hundred fifty-seven thousand, eighty-nine".