12711535578 has 72 divisors (see below), whose sum is σ = 32658863328. Its totient is φ = 3629988432.

The previous prime is 12711535567. The next prime is 12711535583. The reversal of 12711535578 is 87553511721.

12711535578 is a `hidden beast` number, since 1 + 2 + 71 + 1 + 5 + 3 + 5 + 578 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6575100 + ... + 6577032.

It is an arithmetic number, because the mean of its divisors is an integer number (453595324).

Almost surely, 2^12711535578 is an apocalyptic number.

12711535578 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12711535578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16329431664).

12711535578 is an abundant number, since it is smaller than the sum of its proper divisors (19947327750).

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

12711535578 is an frugal number, since it uses more digits than its factorization.

12711535578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3890 (or 1945 counting only the distinct ones).

The product of its digits is 294000, while the sum is 45.

The spelling of 12711535578 in words is "twelve billion, seven hundred eleven million, five hundred thirty-five thousand, five hundred seventy-eight".