66013659 has 6 divisors (see below), whose sum is σ = 95353076. Its totient is φ = 44009100.

The previous prime is 66013639. The next prime is 66013667. The reversal of 66013659 is 95631066.

It is not a de Polignac number, because 66013659 - 2⁷ = 66013531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66013639) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3667417 + ... + 3667434.

Almost surely, 2^66013659 is an apocalyptic number.

66013659 is a deficient number, since it is larger than the sum of its proper divisors (29339417).

66013659 is a wasteful number, since it uses less digits than its factorization.

66013659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7334857 (or 7334854 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 66013659 is about 8124.8790144838. The cubic root of 66013659 is about 404.1518785723.

The spelling of 66013659 in words is "sixty-six million, thirteen thousand, six hundred fifty-nine".