12840623651761 has 4 divisors (see below), whose sum is σ = 12841212611952. Its totient is φ = 12840034691572.

The previous prime is 12840623651701. The next prime is 12840623651809. The reversal of 12840623651761 is 16715632604821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12840623651761 - 2²³ = 12840615263153 is a prime.

It is a super-2 number, since 2×12840623651761² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12840623651699 and 12840623651708.

It is not an unprimeable number, because it can be changed into a prime (12840623651701) 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, 294447391 + ... + 294490996.

It is an arithmetic number, because the mean of its divisors is an integer number (3210303152988).

Almost surely, 2^{12840623651761} is an apocalyptic number.

It is an amenable number.

12840623651761 is a deficient number, since it is larger than the sum of its proper divisors (588960191).

12840623651761 is an equidigital number, since it uses as much as digits as its factorization.

12840623651761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588960190.

The product of its (nonzero) digits is 2903040, while the sum is 52.

The spelling of 12840623651761 in words is "twelve trillion, eight hundred forty billion, six hundred twenty-three million, six hundred fifty-one thousand, seven hundred sixty-one".