11855366388 has 144 divisors (see below), whose sum is σ = 32795409920. Its totient is φ = 3734416224.

The previous prime is 11855366351. The next prime is 11855366401. The reversal of 11855366388 is 88366355811.

11855366388 is a `hidden beast` number, since 1 + 1 + 8 + 553 + 6 + 6 + 3 + 88 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13425795 + ... + 13426677.

Almost surely, 2^11855366388 is an apocalyptic number.

11855366388 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11855366388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16397704960).

11855366388 is an abundant number, since it is smaller than the sum of its proper divisors (20940043532).

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

11855366388 is a wasteful number, since it uses less digits than its factorization.

11855366388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1648 (or 1634 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 54.

The spelling of 11855366388 in words is "eleven billion, eight hundred fifty-five million, three hundred sixty-six thousand, three hundred eighty-eight".