66851658683 has 2 divisors, whose sum is σ = 66851658684. Its totient is φ = 66851658682.

The previous prime is 66851658677. The next prime is 66851658733. The reversal of 66851658683 is 38685615866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66851658683 - 2⁸ = 66851658427 is a prime.

It is not a weakly prime, because it can be changed into another prime (66851658883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33425829341 + 33425829342.

It is an arithmetic number, because the mean of its divisors is an integer number (33425829342).

Almost surely, 2^66851658683 is an apocalyptic number.

66851658683 is a deficient number, since it is larger than the sum of its proper divisors (1).

66851658683 is an equidigital number, since it uses as much as digits as its factorization.

66851658683 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49766400, while the sum is 62.

The spelling of 66851658683 in words is "sixty-six billion, eight hundred fifty-one million, six hundred fifty-eight thousand, six hundred eighty-three".