12615781374 has 96 divisors (see below), whose sum is σ = 32657990400. Its totient is φ = 3599452080.

The previous prime is 12615781369. The next prime is 12615781411. The reversal of 12615781374 is 47318751621.

12615781374 is a `hidden beast` number, since 1 + 2 + 6 + 1 + 578 + 1 + 3 + 74 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2142967 + ... + 2148845.

It is an arithmetic number, because the mean of its divisors is an integer number (340187400).

Almost surely, 2^12615781374 is an apocalyptic number.

12615781374 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12615781374, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16328995200).

12615781374 is an abundant number, since it is smaller than the sum of its proper divisors (20042209026).

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

12615781374 is a wasteful number, since it uses less digits than its factorization.

12615781374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6715 (or 6702 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The spelling of 12615781374 in words is "twelve billion, six hundred fifteen million, seven hundred eighty-one thousand, three hundred seventy-four".