2155642266643 has 2 divisors, whose sum is σ = 2155642266644. Its totient is φ = 2155642266642.

The previous prime is 2155642266599. The next prime is 2155642266677. The reversal of 2155642266643 is 3466622465512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2155642266643 is a prime.

It is not a weakly prime, because it can be changed into another prime (2155642266683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077821133321 + 1077821133322.

It is an arithmetic number, because the mean of its divisors is an integer number (1077821133322).

Almost surely, 2^{2155642266643} is an apocalyptic number.

2155642266643 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155642266643 is an equidigital number, since it uses as much as digits as its factorization.

2155642266643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12441600, while the sum is 52.

The spelling of 2155642266643 in words is "two trillion, one hundred fifty-five billion, six hundred forty-two million, two hundred sixty-six thousand, six hundred forty-three".