6720556313 has 2 divisors, whose sum is σ = 6720556314. Its totient is φ = 6720556312.

The previous prime is 6720556289. The next prime is 6720556319. The reversal of 6720556313 is 3136550276.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4584914944 + 2135641369 = 67712^2 + 46213^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6720556313 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6720556319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3360278156 + 3360278157.

It is an arithmetic number, because the mean of its divisors is an integer number (3360278157).

Almost surely, 2^6720556313 is an apocalyptic number.

It is an amenable number.

6720556313 is a deficient number, since it is larger than the sum of its proper divisors (1).

6720556313 is an equidigital number, since it uses as much as digits as its factorization.

6720556313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113400, while the sum is 38.

The square root of 6720556313 is about 81978.9992193123. Note that the first 3 decimals coincide. The cubic root of 6720556313 is about 1887.1296643899.

The spelling of 6720556313 in words is "six billion, seven hundred twenty million, five hundred fifty-six thousand, three hundred thirteen".