668981154211 has 2 divisors, whose sum is σ = 668981154212. Its totient is φ = 668981154210.

The previous prime is 668981154209. The next prime is 668981154263. The reversal of 668981154211 is 112451189866.

It is an a-pointer prime, because the next prime (668981154263) can be obtained adding 668981154211 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668981154211 - 2¹ = 668981154209 is a prime.

Together with 668981154209, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (668981154811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334490577105 + 334490577106.

It is an arithmetic number, because the mean of its divisors is an integer number (334490577106).

Almost surely, 2^668981154211 is an apocalyptic number.

668981154211 is a deficient number, since it is larger than the sum of its proper divisors (1).

668981154211 is an equidigital number, since it uses as much as digits as its factorization.

668981154211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 829440, while the sum is 52.

The spelling of 668981154211 in words is "six hundred sixty-eight billion, nine hundred eighty-one million, one hundred fifty-four thousand, two hundred eleven".