1155115542771 has 6 divisors (see below), whose sum is σ = 1668500228460. Its totient is φ = 770077028508.

The previous prime is 1155115542733. The next prime is 1155115542773. The reversal of 1155115542771 is 1772455115511.

1155115542771 is a `hidden beast` number, since 1 + 1 + 5 + 5 + 1 + 1 + 554 + 27 + 71 = 666.

It is not a de Polignac number, because 1155115542771 - 2³¹ = 1152968059123 is a prime.

It is a super-2 number, since 2×1155115542771² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1155115542773) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64173085701 + ... + 64173085718.

It is an arithmetic number, because the mean of its divisors is an integer number (278083371410).

Almost surely, 2^{1155115542771} is an apocalyptic number.

1155115542771 is a deficient number, since it is larger than the sum of its proper divisors (513384685689).

1155115542771 is a wasteful number, since it uses less digits than its factorization.

1155115542771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128346171425 (or 128346171422 counting only the distinct ones).

The product of its digits is 245000, while the sum is 45.

The spelling of 1155115542771 in words is "one trillion, one hundred fifty-five billion, one hundred fifteen million, five hundred forty-two thousand, seven hundred seventy-one".