66513705 has 16 divisors (see below), whose sum is σ = 107619840. Its totient is φ = 35074688.

The previous prime is 66513703. The next prime is 66513719. The reversal of 66513705 is 50731566.

It is a cyclic number.

It is not a de Polignac number, because 66513705 - 2¹ = 66513703 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66513703) 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 15 ways as a sum of consecutive naturals, for example, 23577 + ... + 26246.

It is an arithmetic number, because the mean of its divisors is an integer number (6726240).

Almost surely, 2^66513705 is an apocalyptic number.

It is an amenable number.

66513705 is a deficient number, since it is larger than the sum of its proper divisors (41106135).

66513705 is a wasteful number, since it uses less digits than its factorization.

66513705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49920.

The product of its (nonzero) digits is 18900, while the sum is 33.

The square root of 66513705 is about 8155.5934793245. The cubic root of 66513705 is about 405.1697809725.

The spelling of 66513705 in words is "sixty-six million, five hundred thirteen thousand, seven hundred five".