1557448836991 has 2 divisors, whose sum is σ = 1557448836992. Its totient is φ = 1557448836990.

The previous prime is 1557448836971. The next prime is 1557448837001. The reversal of 1557448836991 is 1996388447551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1557448836991 - 2²³ = 1557440448383 is a prime.

It is a super-3 number, since 3×1557448836991³ (a number of 38 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1557448836991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1557448836901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778724418495 + 778724418496.

It is an arithmetic number, because the mean of its divisors is an integer number (778724418496).

Almost surely, 2^{1557448836991} is an apocalyptic number.

1557448836991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1557448836991 is an equidigital number, since it uses as much as digits as its factorization.

1557448836991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 261273600, while the sum is 70.

The spelling of 1557448836991 in words is "one trillion, five hundred fifty-seven billion, four hundred forty-eight million, eight hundred thirty-six thousand, nine hundred ninety-one".