1257444664477 has 2 divisors, whose sum is σ = 1257444664478. Its totient is φ = 1257444664476.

The previous prime is 1257444664453. The next prime is 1257444664507. The reversal of 1257444664477 is 7744664447521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1205090190756 + 52354473721 = 1097766^2 + 228811^2 .

It is a cyclic number.

It is not a de Polignac number, because 1257444664477 - 2¹¹ = 1257444662429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1257444668477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628722332238 + 628722332239.

It is an arithmetic number, because the mean of its divisors is an integer number (628722332239).

Almost surely, 2^{1257444664477} is an apocalyptic number.

It is an amenable number.

1257444664477 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257444664477 is an equidigital number, since it uses as much as digits as its factorization.

1257444664477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 126443520, while the sum is 61.

The spelling of 1257444664477 in words is "one trillion, two hundred fifty-seven billion, four hundred forty-four million, six hundred sixty-four thousand, four hundred seventy-seven".