11155955559551 has 24 divisors (see below), whose sum is σ = 12283145210112. Its totient is φ = 10124578054800.

The previous prime is 11155955559521. The next prime is 11155955559569. The reversal of 11155955559551 is 15595555955111.

It is a de Polignac number, because none of the positive numbers 2^k-11155955559551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11155955559521) 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 23 ways as a sum of consecutive naturals, for example, 172268360 + ... + 172333106.

It is an arithmetic number, because the mean of its divisors is an integer number (511797717088).

Almost surely, 2^{11155955559551} is an apocalyptic number.

11155955559551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11155955559551 is a deficient number, since it is larger than the sum of its proper divisors (1127189650561).

11155955559551 is a wasteful number, since it uses less digits than its factorization.

11155955559551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67163 (or 67152 counting only the distinct ones).

The product of its digits is 31640625, while the sum is 62.

The spelling of 11155955559551 in words is "eleven trillion, one hundred fifty-five billion, nine hundred fifty-five million, five hundred fifty-nine thousand, five hundred fifty-one".