1557655436009 has 2 divisors, whose sum is σ = 1557655436010. Its totient is φ = 1557655436008.

The previous prime is 1557655435939. The next prime is 1557655436023. The reversal of 1557655436009 is 9006345567551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1538909718784 + 18745717225 = 1240528^2 + 136915^2 .

It is a cyclic number.

It is not a de Polignac number, because 1557655436009 - 2⁸ = 1557655435753 is a prime.

It is not a weakly prime, because it can be changed into another prime (1557655432009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778827718004 + 778827718005.

It is an arithmetic number, because the mean of its divisors is an integer number (778827718005).

Almost surely, 2^{1557655436009} is an apocalyptic number.

It is an amenable number.

1557655436009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1557655436009 is an equidigital number, since it uses as much as digits as its factorization.

1557655436009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17010000, while the sum is 56.

The spelling of 1557655436009 in words is "one trillion, five hundred fifty-seven billion, six hundred fifty-five million, four hundred thirty-six thousand, nine".