12840677905 has 24 divisors (see below), whose sum is σ = 16959488616. Its totient is φ = 9326254080.

The previous prime is 12840677893. The next prime is 12840677909. The reversal of 12840677905 is 50977604821.

It can be written as a sum of positive squares in 4 ways, for example, as 663114001 + 12177563904 = 25751^2 + 110352^2 .

It is not a de Polignac number, because 12840677905 - 2²³ = 12832289297 is a prime.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12840677909) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 453937 + ... + 481393.

It is an arithmetic number, because the mean of its divisors is an integer number (706645359).

Almost surely, 2^12840677905 is an apocalyptic number.

It is an amenable number.

12840677905 is a deficient number, since it is larger than the sum of its proper divisors (4118810711).

12840677905 is a wasteful number, since it uses less digits than its factorization.

12840677905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28257 (or 28246 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 12840677905 in words is "twelve billion, eight hundred forty million, six hundred seventy-seven thousand, nine hundred five".