1261603766473 has 2 divisors, whose sum is σ = 1261603766474. Its totient is φ = 1261603766472.

The previous prime is 1261603766417. The next prime is 1261603766497. The reversal of 1261603766473 is 3746673061621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 883276669584 + 378327096889 = 939828^2 + 615083^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261603766473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1261603766473.

It is not a weakly prime, because it can be changed into another prime (1261603763473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630801883236 + 630801883237.

It is an arithmetic number, because the mean of its divisors is an integer number (630801883237).

Almost surely, 2^{1261603766473} is an apocalyptic number.

It is an amenable number.

1261603766473 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261603766473 is an equidigital number, since it uses as much as digits as its factorization.

1261603766473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4572288, while the sum is 52.

The spelling of 1261603766473 in words is "one trillion, two hundred sixty-one billion, six hundred three million, seven hundred sixty-six thousand, four hundred seventy-three".