6520666246513 has 4 divisors (see below), whose sum is σ = 6539457792240. Its totient is φ = 6501874700788.

The previous prime is 6520666246469. The next prime is 6520666246531. The reversal of 6520666246513 is 3156426660256.

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 a de Polignac number, because none of the positive numbers 2^k-6520666246513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6520666246543) 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, 9395772343 + ... + 9395773036.

It is an arithmetic number, because the mean of its divisors is an integer number (1634864448060).

Almost surely, 2^{6520666246513} is an apocalyptic number.

It is an amenable number.

6520666246513 is a deficient number, since it is larger than the sum of its proper divisors (18791545727).

6520666246513 is a wasteful number, since it uses less digits than its factorization.

6520666246513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18791545726.

The product of its (nonzero) digits is 9331200, while the sum is 52.

The spelling of 6520666246513 in words is "six trillion, five hundred twenty billion, six hundred sixty-six million, two hundred forty-six thousand, five hundred thirteen".