66853643 has 2 divisors, whose sum is σ = 66853644. Its totient is φ = 66853642.

The previous prime is 66853637. The next prime is 66853649. The reversal of 66853643 is 34635866.

It is a balanced prime because it is at equal distance from previous prime (66853637) and next prime (66853649).

It is a cyclic number.

It is not a de Polignac number, because 66853643 - 2²⁰ = 65805067 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66853643.

It is not a weakly prime, because it can be changed into another prime (66853649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33426821 + 33426822.

It is an arithmetic number, because the mean of its divisors is an integer number (33426822).

Almost surely, 2^66853643 is an apocalyptic number.

66853643 is a deficient number, since it is larger than the sum of its proper divisors (1).

66853643 is an equidigital number, since it uses as much as digits as its factorization.

66853643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 41.

The square root of 66853643 is about 8176.4077075449. The cubic root of 66853643 is about 405.8588551408.

The spelling of 66853643 in words is "sixty-six million, eight hundred fifty-three thousand, six hundred forty-three".