668272081 has 2 divisors, whose sum is σ = 668272082. Its totient is φ = 668272080.

The previous prime is 668272069. The next prime is 668272097. The reversal of 668272081 is 180272866.

668272081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 385729600 + 282542481 = 19640^2 + 16809^2 .

It is a cyclic number.

It is not a de Polignac number, because 668272081 - 2⁷ = 668271953 is a prime.

It is a super-2 number, since 2×668272081² = 893175148488141122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (668272021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334136040 + 334136041.

It is an arithmetic number, because the mean of its divisors is an integer number (334136041).

Almost surely, 2^668272081 is an apocalyptic number.

It is an amenable number.

668272081 is a deficient number, since it is larger than the sum of its proper divisors (1).

668272081 is an equidigital number, since it uses as much as digits as its factorization.

668272081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 668272081 is about 25850.9589957510. The cubic root of 668272081 is about 874.2811319061.

The spelling of 668272081 in words is "six hundred sixty-eight million, two hundred seventy-two thousand, eighty-one".