1183840511985 has 12 divisors (see below), whose sum is σ = 2051990220852. Its totient is φ = 631381606368.

The previous prime is 1183840511983. The next prime is 1183840511993. The reversal of 1183840511985 is 5891150483811.

1183840511985 is a `hidden beast` number, since 1 + 1 + 8 + 3 + 8 + 40 + 511 + 9 + 85 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 807782120289 + 376058391696 = 898767^2 + 613236^2 .

It is not a de Polignac number, because 1183840511985 - 2¹ = 1183840511983 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1183840511983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13153783422 + ... + 13153783511.

It is an arithmetic number, because the mean of its divisors is an integer number (170999185071).

Almost surely, 2^{1183840511985} is an apocalyptic number.

1183840511985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1183840511985 is a deficient number, since it is larger than the sum of its proper divisors (868149708867).

1183840511985 is a wasteful number, since it uses less digits than its factorization.

1183840511985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26307566944 (or 26307566941 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 54.

The spelling of 1183840511985 in words is "one trillion, one hundred eighty-three billion, eight hundred forty million, five hundred eleven thousand, nine hundred eighty-five".