6355617501557 has 2 divisors, whose sum is σ = 6355617501558. Its totient is φ = 6355617501556.

The previous prime is 6355617501473. The next prime is 6355617501581. The reversal of 6355617501557 is 7551057165536.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6296691881041 + 58925620516 = 2509321^2 + 242746^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6355617501557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6355617501157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3177808750778 + 3177808750779.

It is an arithmetic number, because the mean of its divisors is an integer number (3177808750779).

Almost surely, 2^{6355617501557} is an apocalyptic number.

It is an amenable number.

6355617501557 is a deficient number, since it is larger than the sum of its proper divisors (1).

6355617501557 is an equidigital number, since it uses as much as digits as its factorization.

6355617501557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16537500, while the sum is 56.

The spelling of 6355617501557 in words is "six trillion, three hundred fifty-five billion, six hundred seventeen million, five hundred one thousand, five hundred fifty-seven".