668133077 has 2 divisors, whose sum is σ = 668133078. Its totient is φ = 668133076.

The previous prime is 668133047. The next prime is 668133101. The reversal of 668133077 is 770331866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 628304356 + 39828721 = 25066^2 + 6311^2 .

It is a cyclic number.

It is not a de Polignac number, because 668133077 - 2¹⁴ = 668116693 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668133017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334066538 + 334066539.

It is an arithmetic number, because the mean of its divisors is an integer number (334066539).

Almost surely, 2^668133077 is an apocalyptic number.

It is an amenable number.

668133077 is a deficient number, since it is larger than the sum of its proper divisors (1).

668133077 is an equidigital number, since it uses as much as digits as its factorization.

668133077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 41.

The square root of 668133077 is about 25848.2702902922. The cubic root of 668133077 is about 874.2205093916.

The spelling of 668133077 in words is "six hundred sixty-eight million, one hundred thirty-three thousand, seventy-seven".