11551999998 has 96 divisors (see below), whose sum is σ = 29943571968. Its totient is φ = 2936640000.

The previous prime is 11551999997. The next prime is 11552000023. The reversal of 11551999998 is 89999915511.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11551999997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 113998 + ... + 189998.

It is an arithmetic number, because the mean of its divisors is an integer number (311912208).

Almost surely, 2^11551999998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11551999998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14971785984).

11551999998 is an abundant number, since it is smaller than the sum of its proper divisors (18391571970).

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

11551999998 is a wasteful number, since it uses less digits than its factorization.

11551999998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76078 (or 76071 counting only the distinct ones).

The product of its digits is 11809800, while the sum is 66.

The spelling of 11551999998 in words is "eleven billion, five hundred fifty-one million, nine hundred ninety-nine thousand, nine hundred ninety-eight".