11531564055 has 64 divisors (see below), whose sum is σ = 22384419840. Its totient is φ = 5586019200.

The previous prime is 11531564053. The next prime is 11531564167. The reversal of 11531564055 is 55046513511.

11531564055 is a `hidden beast` number, since 1 + 1 + 5 + 3 + 1 + 5 + 640 + 5 + 5 = 666.

It is not a de Polignac number, because 11531564055 - 2¹ = 11531564053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11531564053) 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 63 ways as a sum of consecutive naturals, for example, 2047974 + ... + 2053596.

It is an arithmetic number, because the mean of its divisors is an integer number (349756560).

Almost surely, 2^11531564055 is an apocalyptic number.

11531564055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11531564055 is a deficient number, since it is larger than the sum of its proper divisors (10852855785).

11531564055 is a wasteful number, since it uses less digits than its factorization.

11531564055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7029 (or 7023 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The spelling of 11531564055 in words is "eleven billion, five hundred thirty-one million, five hundred sixty-four thousand, fifty-five".