1557818634223 has 2 divisors, whose sum is σ = 1557818634224. Its totient is φ = 1557818634222.

The previous prime is 1557818634193. The next prime is 1557818634343. The reversal of 1557818634223 is 3224368187551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1557818634223 - 2¹³ = 1557818626031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1557818634923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778909317111 + 778909317112.

It is an arithmetic number, because the mean of its divisors is an integer number (778909317112).

Almost surely, 2^{1557818634223} is an apocalyptic number.

1557818634223 is a deficient number, since it is larger than the sum of its proper divisors (1).

1557818634223 is an equidigital number, since it uses as much as digits as its factorization.

1557818634223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9676800, while the sum is 55.

The spelling of 1557818634223 in words is "one trillion, five hundred fifty-seven billion, eight hundred eighteen million, six hundred thirty-four thousand, two hundred twenty-three".