11538531456 has 64 divisors (see below), whose sum is σ = 30661420320. Its totient is φ = 3844646912.

The previous prime is 11538531449. The next prime is 11538531457. The reversal of 11538531456 is 65413583511.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×11538531456² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11538531457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1375531 + ... + 1383893.

Almost surely, 2^11538531456 is an apocalyptic number.

11538531456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

11538531456 is an abundant number, since it is smaller than the sum of its proper divisors (19122888864).

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

11538531456 is an equidigital number, since it uses as much as digits as its factorization.

11538531456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11973 (or 11961 counting only the distinct ones).

The product of its digits is 216000, while the sum is 42.

The spelling of 11538531456 in words is "eleven billion, five hundred thirty-eight million, five hundred thirty-one thousand, four hundred fifty-six".