12720055739 has 4 divisors (see below), whose sum is σ = 12732539640. Its totient is φ = 12707571840.

The previous prime is 12720055727. The next prime is 12720055759. The reversal of 12720055739 is 93755002721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93755002721 = 65519 ⋅1430959.

It is a cyclic number.

It is not a de Polignac number, because 12720055739 - 2⁸ = 12720055483 is a prime.

It is a super-2 number, since 2×12720055739² (a number of 21 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 = 12720055696 and 12720055705.

It is not an unprimeable number, because it can be changed into a prime (12720055759) 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, 6240422 + ... + 6242459.

It is an arithmetic number, because the mean of its divisors is an integer number (3183134910).

Almost surely, 2^12720055739 is an apocalyptic number.

12720055739 is a deficient number, since it is larger than the sum of its proper divisors (12483901).

12720055739 is a wasteful number, since it uses less digits than its factorization.

12720055739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12483900.

The product of its (nonzero) digits is 132300, while the sum is 41.

The spelling of 12720055739 in words is "twelve billion, seven hundred twenty million, fifty-five thousand, seven hundred thirty-nine".