12720763993 has 16 divisors (see below), whose sum is σ = 14748713856. Its totient is φ = 10745723520.

The previous prime is 12720763969. The next prime is 12720764047. The reversal of 12720763993 is 39936702721.

It is a de Polignac number, because none of the positive numbers 2^k-12720763993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12720773993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 692538 + ... + 710668.

It is an arithmetic number, because the mean of its divisors is an integer number (921794616).

Almost surely, 2^12720763993 is an apocalyptic number.

It is an amenable number.

12720763993 is a deficient number, since it is larger than the sum of its proper divisors (2027949863).

12720763993 is a wasteful number, since it uses less digits than its factorization.

12720763993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19584.

The product of its (nonzero) digits is 857304, while the sum is 49.

The spelling of 12720763993 in words is "twelve billion, seven hundred twenty million, seven hundred sixty-three thousand, nine hundred ninety-three".