1668335110261 has 2 divisors, whose sum is σ = 1668335110262. Its totient is φ = 1668335110260.

The previous prime is 1668335110223. The next prime is 1668335110339. The reversal of 1668335110261 is 1620115338661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 913565109636 + 754770000625 = 955806^2 + 868775^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668335110261 - 2¹³ = 1668335102069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1668335110061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834167555130 + 834167555131.

It is an arithmetic number, because the mean of its divisors is an integer number (834167555131).

Almost surely, 2^{1668335110261} is an apocalyptic number.

It is an amenable number.

1668335110261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668335110261 is an equidigital number, since it uses as much as digits as its factorization.

1668335110261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 1668335110261 in words is "one trillion, six hundred sixty-eight billion, three hundred thirty-five million, one hundred ten thousand, two hundred sixty-one".