12720645135513 has 96 divisors (see below), whose sum is σ = 22729100599296. Its totient is φ = 6951255651648.

The previous prime is 12720645135511. The next prime is 12720645135593. The reversal of 12720645135513 is 31553154602721.

12720645135513 is a `hidden beast` number, since 1 + 2 + 7 + 20 + 64 + 5 + 13 + 551 + 3 = 666.

It is not a de Polignac number, because 12720645135513 - 2¹ = 12720645135511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12720645135511) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 175743456 + ... + 175815822.

It is an arithmetic number, because the mean of its divisors is an integer number (236761464576).

Almost surely, 2^{12720645135513} is an apocalyptic number.

It is an amenable number.

12720645135513 is a deficient number, since it is larger than the sum of its proper divisors (10008455463783).

12720645135513 is an equidigital number, since it uses as much as digits as its factorization.

12720645135513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76905 (or 76893 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 45.

The spelling of 12720645135513 in words is "twelve trillion, seven hundred twenty billion, six hundred forty-five million, one hundred thirty-five thousand, five hundred thirteen".