1257225538543 has 4 divisors (see below), whose sum is σ = 1353935195368. Its totient is φ = 1160515881720.

The previous prime is 1257225538537. The next prime is 1257225538549. The reversal of 1257225538543 is 3458355227521.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1257225538537) and next prime (1257225538549).

It is not a de Polignac number, because 1257225538543 - 2⁵ = 1257225538511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257225538549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48354828393 + ... + 48354828418.

It is an arithmetic number, because the mean of its divisors is an integer number (338483798842).

Almost surely, 2^{1257225538543} is an apocalyptic number.

1257225538543 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1257225538543 is a deficient number, since it is larger than the sum of its proper divisors (96709656825).

1257225538543 is an equidigital number, since it uses as much as digits as its factorization.

1257225538543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96709656824.

The product of its digits is 10080000, while the sum is 52.

The spelling of 1257225538543 in words is "one trillion, two hundred fifty-seven billion, two hundred twenty-five million, five hundred thirty-eight thousand, five hundred forty-three".