668239427827 has 2 divisors, whose sum is σ = 668239427828. Its totient is φ = 668239427826.

The previous prime is 668239427731. The next prime is 668239427861. The reversal of 668239427827 is 728724932866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668239427827 - 2¹⁹ = 668238903539 is a prime.

It is not a weakly prime, because it can be changed into another prime (668239427327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334119713913 + 334119713914.

It is an arithmetic number, because the mean of its divisors is an integer number (334119713914).

Almost surely, 2^668239427827 is an apocalyptic number.

668239427827 is a deficient number, since it is larger than the sum of its proper divisors (1).

668239427827 is an equidigital number, since it uses as much as digits as its factorization.

668239427827 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97542144, while the sum is 64.

The spelling of 668239427827 in words is "six hundred sixty-eight billion, two hundred thirty-nine million, four hundred twenty-seven thousand, eight hundred twenty-seven".