1155232505985 has 16 divisors (see below), whose sum is σ = 1893454254720. Its totient is φ = 601096588160.

The previous prime is 1155232505927. The next prime is 1155232505989. The reversal of 1155232505985 is 5895052325511.

It is not a de Polignac number, because 1155232505985 - 2¹¹ = 1155232503937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1155232505989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 939212805 + ... + 939214034.

It is an arithmetic number, because the mean of its divisors is an integer number (118340890920).

Almost surely, 2^{1155232505985} is an apocalyptic number.

1155232505985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1155232505985 is a deficient number, since it is larger than the sum of its proper divisors (738221748735).

1155232505985 is a wasteful number, since it uses less digits than its factorization.

1155232505985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1878426888.

The product of its (nonzero) digits is 2700000, while the sum is 51.

The spelling of 1155232505985 in words is "one trillion, one hundred fifty-five billion, two hundred thirty-two million, five hundred five thousand, nine hundred eighty-five".