1257861698243 has 2 divisors, whose sum is σ = 1257861698244. Its totient is φ = 1257861698242.

The previous prime is 1257861698207. The next prime is 1257861698257. The reversal of 1257861698243 is 3428961687521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1257861698243 - 2⁶ = 1257861698179 is a prime.

It is not a weakly prime, because it can be changed into another prime (1257861698273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628930849121 + 628930849122.

It is an arithmetic number, because the mean of its divisors is an integer number (628930849122).

Almost surely, 2^{1257861698243} is an apocalyptic number.

1257861698243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257861698243 is an equidigital number, since it uses as much as digits as its factorization.

1257861698243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34836480, while the sum is 62.

The spelling of 1257861698243 in words is "one trillion, two hundred fifty-seven billion, eight hundred sixty-one million, six hundred ninety-eight thousand, two hundred forty-three".