1155718161 has 72 divisors (see below), whose sum is σ = 1890410496. Its totient is φ = 679311360.

The previous prime is 1155718153. The next prime is 1155718177. The reversal of 1155718161 is 1618175511.

1155718161 is a `hidden beast` number, since 1 + 1 + 5 + 571 + 81 + 6 + 1 = 666.

It is not a de Polignac number, because 1155718161 - 2³ = 1155718153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1155718061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 5988081 + ... + 5988273.

Almost surely, 2^1155718161 is an apocalyptic number.

It is an amenable number.

1155718161 is a deficient number, since it is larger than the sum of its proper divisors (734692335).

1155718161 is a wasteful number, since it uses less digits than its factorization.

1155718161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383 (or 367 counting only the distinct ones).

The product of its digits is 8400, while the sum is 36.

The square root of 1155718161 is about 33995.8550561682. The cubic root of 1155718161 is about 1049.4231634345.

The spelling of 1155718161 in words is "one billion, one hundred fifty-five million, seven hundred eighteen thousand, one hundred sixty-one".