1243704533779 has 2 divisors, whose sum is σ = 1243704533780. Its totient is φ = 1243704533778.

The previous prime is 1243704533737. The next prime is 1243704533789. The reversal of 1243704533779 is 9773354073421.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1243704533779 is a prime.

It is not a weakly prime, because it can be changed into another prime (1243704533789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621852266889 + 621852266890.

It is an arithmetic number, because the mean of its divisors is an integer number (621852266890).

Almost surely, 2^{1243704533779} is an apocalyptic number.

1243704533779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243704533779 is an equidigital number, since it uses as much as digits as its factorization.

1243704533779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13335840, while the sum is 55.

The spelling of 1243704533779 in words is "one trillion, two hundred forty-three billion, seven hundred four million, five hundred thirty-three thousand, seven hundred seventy-nine".