1331256747553 has 2 divisors, whose sum is σ = 1331256747554. Its totient is φ = 1331256747552.

The previous prime is 1331256747511. The next prime is 1331256747607. The reversal of 1331256747553 is 3557476521331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1329854095249 + 1402652304 = 1153193^2 + 37452^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331256747553 - 2²⁹ = 1330719876641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1331256747553.

It is not a weakly prime, because it can be changed into another prime (1331256747253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665628373776 + 665628373777.

It is an arithmetic number, because the mean of its divisors is an integer number (665628373777).

Almost surely, 2^{1331256747553} is an apocalyptic number.

It is an amenable number.

1331256747553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331256747553 is an equidigital number, since it uses as much as digits as its factorization.

1331256747553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7938000, while the sum is 52.

The spelling of 1331256747553 in words is "one trillion, three hundred thirty-one billion, two hundred fifty-six million, seven hundred forty-seven thousand, five hundred fifty-three".