11550521808 has 80 divisors (see below), whose sum is σ = 37890610560. Its totient is φ = 3300148224.

The previous prime is 11550521797. The next prime is 11550521809. The reversal of 11550521808 is 80812505511.

11550521808 is a `hidden beast` number, since 1 + 1 + 5 + 50 + 521 + 80 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11550521809) 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, 1906785 + ... + 1912832.

It is an arithmetic number, because the mean of its divisors is an integer number (473632632).

Almost surely, 2^11550521808 is an apocalyptic number.

11550521808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

11550521808 is an abundant number, since it is smaller than the sum of its proper divisors (26340088752).

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

11550521808 is a wasteful number, since it uses less digits than its factorization.

11550521808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3819641 (or 3819629 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 36.

The spelling of 11550521808 in words is "eleven billion, five hundred fifty million, five hundred twenty-one thousand, eight hundred eight".