12511543440 has 80 divisors (see below), whose sum is σ = 42311774016. Its totient is φ = 3033100800.

The previous prime is 12511543439. The next prime is 12511543463. The reversal of 12511543440 is 4434511521.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 12511543398 and 12511543407.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2366971 + ... + 2372250.

Almost surely, 2^12511543440 is an apocalyptic number.

12511543440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12511543440 is an abundant number, since it is smaller than the sum of its proper divisors (29800230576).

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

12511543440 is a wasteful number, since it uses less digits than its factorization.

12511543440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4739248 (or 4739242 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The spelling of 12511543440 in words is "twelve billion, five hundred eleven million, five hundred forty-three thousand, four hundred forty".