66856383 has 24 divisors (see below), whose sum is σ = 110897280. Its totient is φ = 38385360.

The previous prime is 66856351. The next prime is 66856399. The reversal of 66856383 is 38365866.

66856383 is a `hidden beast` number, since 6 + 6 + 8 + 5 + 638 + 3 = 666.

It is not a de Polignac number, because 66856383 - 2⁵ = 66856351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66156383) 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, 15891 + ... + 19652.

It is an arithmetic number, because the mean of its divisors is an integer number (4620720).

Almost surely, 2^66856383 is an apocalyptic number.

66856383 is a deficient number, since it is larger than the sum of its proper divisors (44040897).

66856383 is a wasteful number, since it uses less digits than its factorization.

66856383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35579 (or 35576 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 66856383 is about 8176.5752610736. The cubic root of 66856383 is about 405.8643997804.

The spelling of 66856383 in words is "sixty-six million, eight hundred fifty-six thousand, three hundred eighty-three".