66956513 has 8 divisors (see below), whose sum is σ = 75902400. Its totient is φ = 58552848.

The previous prime is 66956507. The next prime is 66956531. The reversal of 66956513 is 31565966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66956513 - 2¹⁰ = 66955489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66956573) 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 7 ways as a sum of consecutive naturals, for example, 135293 + ... + 135786.

It is an arithmetic number, because the mean of its divisors is an integer number (9487800).

Almost surely, 2^66956513 is an apocalyptic number.

It is an amenable number.

66956513 is a deficient number, since it is larger than the sum of its proper divisors (8945887).

66956513 is a wasteful number, since it uses less digits than its factorization.

66956513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271111.

The product of its digits is 145800, while the sum is 41.

The square root of 66956513 is about 8182.6959493800. The cubic root of 66956513 is about 406.0669181195.

The spelling of 66956513 in words is "sixty-six million, nine hundred fifty-six thousand, five hundred thirteen".