1557818634343 has 2 divisors, whose sum is σ = 1557818634344. Its totient is φ = 1557818634342.

The previous prime is 1557818634223. The next prime is 1557818634367. The reversal of 1557818634343 is 3434368187551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1557818634343 - 2¹⁷ = 1557818503271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1557818632343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778909317171 + 778909317172.

It is an arithmetic number, because the mean of its divisors is an integer number (778909317172).

Almost surely, 2^{1557818634343} is an apocalyptic number.

1557818634343 is a deficient number, since it is larger than the sum of its proper divisors (1).

1557818634343 is an equidigital number, since it uses as much as digits as its factorization.

1557818634343 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29030400, while the sum is 58.

The spelling of 1557818634343 in words is "one trillion, five hundred fifty-seven billion, eight hundred eighteen million, six hundred thirty-four thousand, three hundred forty-three".