668687827 has 2 divisors, whose sum is σ = 668687828. Its totient is φ = 668687826.

The previous prime is 668687813. The next prime is 668687927. The reversal of 668687827 is 728786866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668687827 - 2⁷ = 668687699 is a prime.

It is not a weakly prime, because it can be changed into another prime (668687807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334343913 + 334343914.

It is an arithmetic number, because the mean of its divisors is an integer number (334343914).

Almost surely, 2^668687827 is an apocalyptic number.

668687827 is a deficient number, since it is larger than the sum of its proper divisors (1).

668687827 is an equidigital number, since it uses as much as digits as its factorization.

668687827 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10838016, while the sum is 58.

The square root of 668687827 is about 25858.9989558761. The cubic root of 668687827 is about 874.4623971641.

The spelling of 668687827 in words is "six hundred sixty-eight million, six hundred eighty-seven thousand, eight hundred twenty-seven".