11855986900 has 18 divisors (see below), whose sum is σ = 25727491790. Its totient is φ = 4742394720.

The previous prime is 11855986873. The next prime is 11855986903. The reversal of 11855986900 is 968955811.

It can be written as a sum of positive squares in 3 ways, for example, as 33339076 + 11822647824 = 5774^2 + 108732^2 .

It is a super-2 number, since 2×11855986900² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11855986903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 59279835 + ... + 59280034.

Almost surely, 2^11855986900 is an apocalyptic number.

11855986900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11855986900 is an abundant number, since it is smaller than the sum of its proper divisors (13871504890).

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

11855986900 is a wasteful number, since it uses less digits than its factorization.

11855986900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118559883 (or 118559876 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 52.

The spelling of 11855986900 in words is "eleven billion, eight hundred fifty-five million, nine hundred eighty-six thousand, nine hundred".