668619827 has 2 divisors, whose sum is σ = 668619828. Its totient is φ = 668619826.

The previous prime is 668619793. The next prime is 668619929. The reversal of 668619827 is 728916866.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668619827 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (668619527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334309913 + 334309914.

It is an arithmetic number, because the mean of its divisors is an integer number (334309914).

Almost surely, 2^668619827 is an apocalyptic number.

668619827 is a deficient number, since it is larger than the sum of its proper divisors (1).

668619827 is an equidigital number, since it uses as much as digits as its factorization.

668619827 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 53.

The square root of 668619827 is about 25857.6840997024. The cubic root of 668619827 is about 874.4327543042.

The spelling of 668619827 in words is "six hundred sixty-eight million, six hundred nineteen thousand, eight hundred twenty-seven".