1155571556057 has 2 divisors, whose sum is σ = 1155571556058. Its totient is φ = 1155571556056.

The previous prime is 1155571555951. The next prime is 1155571556099. The reversal of 1155571556057 is 7506551755511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1012188917776 + 143382638281 = 1006076^2 + 378659^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155571556057 - 2¹² = 1155571551961 is a prime.

It is not a weakly prime, because it can be changed into another prime (1155571556857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577785778028 + 577785778029.

It is an arithmetic number, because the mean of its divisors is an integer number (577785778029).

Almost surely, 2^{1155571556057} is an apocalyptic number.

It is an amenable number.

1155571556057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155571556057 is an equidigital number, since it uses as much as digits as its factorization.

1155571556057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4593750, while the sum is 53.

The spelling of 1155571556057 in words is "one trillion, one hundred fifty-five billion, five hundred seventy-one million, five hundred fifty-six thousand, fifty-seven".