11511551055 has 16 divisors (see below), whose sum is σ = 18420785280. Its totient is φ = 6138726048.

The previous prime is 11511551041. The next prime is 11511551059. The reversal of 11511551055 is 55015511511.

It is a happy number.

It is not a de Polignac number, because 11511551055 - 2¹⁹ = 11511026767 is a prime.

It is a super-2 number, since 2×11511551055² (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 (11511551059) 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, 88456 + ... + 175634.

It is an arithmetic number, because the mean of its divisors is an integer number (1151299080).

Almost surely, 2^11511551055 is an apocalyptic number.

11511551055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11511551055 is a deficient number, since it is larger than the sum of its proper divisors (6909234225).

11511551055 is an equidigital number, since it uses as much as digits as its factorization.

11511551055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95990.

The product of its (nonzero) digits is 3125, while the sum is 30.

The spelling of 11511551055 in words is "eleven billion, five hundred eleven million, five hundred fifty-one thousand, fifty-five".