1155165505 has 32 divisors (see below), whose sum is σ = 1525182624. Its totient is φ = 834748416.

The previous prime is 1155165499. The next prime is 1155165511. The reversal of 1155165505 is 5055615511.

It is an interprime number because it is at equal distance from previous prime (1155165499) and next prime (1155165511).

It can be written as a sum of positive squares in 16 ways, for example, as 344510721 + 810654784 = 18561^2 + 28472^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155165505 - 2⁷ = 1155165377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 649177 + ... + 650953.

It is an arithmetic number, because the mean of its divisors is an integer number (47661957).

Almost surely, 2^1155165505 is an apocalyptic number.

It is an amenable number.

1155165505 is a deficient number, since it is larger than the sum of its proper divisors (370017119).

1155165505 is a wasteful number, since it uses less digits than its factorization.

1155165505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2005.

The product of its (nonzero) digits is 18750, while the sum is 34.

The square root of 1155165505 is about 33987.7257991764. The cubic root of 1155165505 is about 1049.2558612618.

The spelling of 1155165505 in words is "one billion, one hundred fifty-five million, one hundred sixty-five thousand, five hundred five".