11863331865 has 144 divisors (see below), whose sum is σ = 25926700800. Its totient is φ = 4912047360.

The previous prime is 11863331849. The next prime is 11863331869. The reversal of 11863331865 is 56813336811.

11863331865 is a `hidden beast` number, since 1 + 1 + 8 + 633 + 3 + 1 + 8 + 6 + 5 = 666.

It is not a de Polignac number, because 11863331865 - 2⁴ = 11863331849 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 11863331865.

It is not an unprimeable number, because it can be changed into a prime (11863331869) 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 143 ways as a sum of consecutive naturals, for example, 16732131 + ... + 16732839.

Almost surely, 2^11863331865 is an apocalyptic number.

11863331865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11863331865 is an abundant number, since it is smaller than the sum of its proper divisors (14063368935).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11863331865 is a wasteful number, since it uses less digits than its factorization.

11863331865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188 (or 1174 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The spelling of 11863331865 in words is "eleven billion, eight hundred sixty-three million, three hundred thirty-one thousand, eight hundred sixty-five".