566666671849 has 2 divisors, whose sum is σ = 566666671850. Its totient is φ = 566666671848.

The previous prime is 566666671771. The next prime is 566666671861. The reversal of 566666671849 is 948176666665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 413243265600 + 153423406249 = 642840^2 + 391693^2 .

It is a cyclic number.

It is not a de Polignac number, because 566666671849 - 2¹⁵ = 566666639081 is a prime.

It is a super-2 number, since 2×566666671849² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (566666678849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 283333335924 + 283333335925.

It is an arithmetic number, because the mean of its divisors is an integer number (283333335925).

Almost surely, 2^566666671849 is an apocalyptic number.

It is an amenable number.

566666671849 is a deficient number, since it is larger than the sum of its proper divisors (1).

566666671849 is an equidigital number, since it uses as much as digits as its factorization.

566666671849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 470292480, while the sum is 70.

The spelling of 566666671849 in words is "five hundred sixty-six billion, six hundred sixty-six million, six hundred seventy-one thousand, eight hundred forty-nine".