1257849972991 has 2 divisors, whose sum is σ = 1257849972992. Its totient is φ = 1257849972990.

The previous prime is 1257849972961. The next prime is 1257849973019. The reversal of 1257849972991 is 1992799487521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1257849972991 - 2⁹ = 1257849972479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1257849972941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628924986495 + 628924986496.

It is an arithmetic number, because the mean of its divisors is an integer number (628924986496).

Almost surely, 2^{1257849972991} is an apocalyptic number.

1257849972991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257849972991 is an equidigital number, since it uses as much as digits as its factorization.

1257849972991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 205752960, while the sum is 73.

The spelling of 1257849972991 in words is "one trillion, two hundred fifty-seven billion, eight hundred forty-nine million, nine hundred seventy-two thousand, nine hundred ninety-one".