2661351226243 has 2 divisors, whose sum is σ = 2661351226244. Its totient is φ = 2661351226242.

The previous prime is 2661351226199. The next prime is 2661351226253. The reversal of 2661351226243 is 3426221531662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2661351226243 - 2²¹ = 2661349129091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2661351226243.

It is not a weakly prime, because it can be changed into another prime (2661351226253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330675613121 + 1330675613122.

It is an arithmetic number, because the mean of its divisors is an integer number (1330675613122).

Almost surely, 2^{2661351226243} is an apocalyptic number.

2661351226243 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661351226243 is an equidigital number, since it uses as much as digits as its factorization.

2661351226243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 43.

The spelling of 2661351226243 in words is "two trillion, six hundred sixty-one billion, three hundred fifty-one million, two hundred twenty-six thousand, two hundred forty-three".