2668175327821 has 2 divisors, whose sum is σ = 2668175327822. Its totient is φ = 2668175327820.

The previous prime is 2668175327791. The next prime is 2668175327837. The reversal of 2668175327821 is 1287235718662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1426087367721 + 1242087960100 = 1194189^2 + 1114490^2 .

It is a cyclic number.

It is not a de Polignac number, because 2668175327821 - 2²¹ = 2668173230669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2668175327891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1334087663910 + 1334087663911.

It is an arithmetic number, because the mean of its divisors is an integer number (1334087663911).

Almost surely, 2^{2668175327821} is an apocalyptic number.

It is an amenable number.

2668175327821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2668175327821 is an equidigital number, since it uses as much as digits as its factorization.

2668175327821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13547520, while the sum is 58.

The spelling of 2668175327821 in words is "two trillion, six hundred sixty-eight billion, one hundred seventy-five million, three hundred twenty-seven thousand, eight hundred twenty-one".