11551110999 has 8 divisors (see below), whose sum is σ = 15402207600. Its totient is φ = 7700377536.

The previous prime is 11551110997. The next prime is 11551111001. The reversal of 11551110999 is 99901115511.

It is an interprime number because it is at equal distance from previous prime (11551110997) and next prime (11551111001).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11551110999 - 2¹ = 11551110997 is a prime.

It is a super-2 number, since 2×11551110999² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11551110999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11551110997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4974 + ... + 152075.

It is an arithmetic number, because the mean of its divisors is an integer number (1925275950).

Almost surely, 2^11551110999 is an apocalyptic number.

11551110999 is a deficient number, since it is larger than the sum of its proper divisors (3851096601).

11551110999 is a wasteful number, since it uses less digits than its factorization.

11551110999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181569.

The product of its (nonzero) digits is 18225, while the sum is 42.

The spelling of 11551110999 in words is "eleven billion, five hundred fifty-one million, one hundred ten thousand, nine hundred ninety-nine".