1557406056659 has 2 divisors, whose sum is σ = 1557406056660. Its totient is φ = 1557406056658.

The previous prime is 1557406056631. The next prime is 1557406056709. The reversal of 1557406056659 is 9566506047551.

It is a weak prime.

It is an emirp because it is prime and its reverse (9566506047551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1557406056659 - 2¹⁶ = 1557405991123 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1557406056598 and 1557406056607.

It is not a weakly prime, because it can be changed into another prime (1557406056259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778703028329 + 778703028330.

It is an arithmetic number, because the mean of its divisors is an integer number (778703028330).

Almost surely, 2^{1557406056659} is an apocalyptic number.

1557406056659 is a deficient number, since it is larger than the sum of its proper divisors (1).

1557406056659 is an equidigital number, since it uses as much as digits as its factorization.

1557406056659 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020000, while the sum is 59.

The spelling of 1557406056659 in words is "one trillion, five hundred fifty-seven billion, four hundred six million, fifty-six thousand, six hundred fifty-nine".