66013857 has 24 divisors (see below), whose sum is σ = 117359424. Its totient is φ = 34820064.

The previous prime is 66013837. The next prime is 66013949. The reversal of 66013857 is 75831066.

It is not a de Polignac number, because 66013857 - 2¹⁰ = 66012833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66013807) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39483 + ... + 41120.

It is an arithmetic number, because the mean of its divisors is an integer number (4889976).

Almost surely, 2^66013857 is an apocalyptic number.

It is an amenable number.

66013857 is a deficient number, since it is larger than the sum of its proper divisors (51345567).

66013857 is a wasteful number, since it uses less digits than its factorization.

66013857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80629 (or 80626 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 66013857 is about 8124.8911992715. The cubic root of 66013857 is about 404.1522826402.

The spelling of 66013857 in words is "sixty-six million, thirteen thousand, eight hundred fifty-seven".