12705256140 has 24 divisors (see below), whose sum is σ = 35574717360. Its totient is φ = 3388068288.

The previous prime is 12705256127. The next prime is 12705256141. The reversal of 12705256140 is 4165250721.

It is a super-2 number, since 2×12705256140² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12705256141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105877075 + ... + 105877194.

It is an arithmetic number, because the mean of its divisors is an integer number (1482279890).

Almost surely, 2^12705256140 is an apocalyptic number.

12705256140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12705256140 is an abundant number, since it is smaller than the sum of its proper divisors (22869461220).

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

12705256140 is a wasteful number, since it uses less digits than its factorization.

12705256140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211754281 (or 211754279 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

The spelling of 12705256140 in words is "twelve billion, seven hundred five million, two hundred fifty-six thousand, one hundred forty".