12611571912 has 64 divisors (see below), whose sum is σ = 35099697600. Its totient is φ = 4195751040.

The previous prime is 12611571901. The next prime is 12611571919. The reversal of 12611571912 is 21917511621.

12611571912 is a `hidden beast` number, since 12 + 61 + 1 + 571 + 9 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (12611571919) 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, 56503 + ... + 168569.

It is an arithmetic number, because the mean of its divisors is an integer number (548432775).

Almost surely, 2^12611571912 is an apocalyptic number.

12611571912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12611571912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17549848800).

12611571912 is an abundant number, since it is smaller than the sum of its proper divisors (22488125688).

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

12611571912 is a wasteful number, since it uses less digits than its factorization.

12611571912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112603 (or 112593 counting only the distinct ones).

The product of its digits is 7560, while the sum is 36.

The spelling of 12611571912 in words is "twelve billion, six hundred eleven million, five hundred seventy-one thousand, nine hundred twelve".