12840655247 has 4 divisors (see below), whose sum is σ = 14675034576. Its totient is φ = 11006275920.

The previous prime is 12840655193. The next prime is 12840655253. The reversal of 12840655247 is 74255604821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74255604821 = 31 ⋅2395342091.

It is a cyclic number.

It is not a de Polignac number, because 12840655247 - 2¹⁶ = 12840589711 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12840655198 and 12840655207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12840655147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 917189654 + ... + 917189667.

It is an arithmetic number, because the mean of its divisors is an integer number (3668758644).

Almost surely, 2^12840655247 is an apocalyptic number.

12840655247 is a deficient number, since it is larger than the sum of its proper divisors (1834379329).

12840655247 is an equidigital number, since it uses as much as digits as its factorization.

12840655247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1834379328.

The product of its (nonzero) digits is 537600, while the sum is 44.

The spelling of 12840655247 in words is "twelve billion, eight hundred forty million, six hundred fifty-five thousand, two hundred forty-seven".