6720399853 has 2 divisors, whose sum is σ = 6720399854. Its totient is φ = 6720399852.

The previous prime is 6720399839. The next prime is 6720399869. The reversal of 6720399853 is 3589930276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4285273444 + 2435126409 = 65462^2 + 49347^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6720399853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6720399853.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6720399823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3360199926 + 3360199927.

It is an arithmetic number, because the mean of its divisors is an integer number (3360199927).

Almost surely, 2^6720399853 is an apocalyptic number.

It is an amenable number.

6720399853 is a deficient number, since it is larger than the sum of its proper divisors (1).

6720399853 is an equidigital number, since it uses as much as digits as its factorization.

6720399853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2449440, while the sum is 52.

The square root of 6720399853 is about 81978.0449449729. The cubic root of 6720399853 is about 1887.1150196401.

The spelling of 6720399853 in words is "six billion, seven hundred twenty million, three hundred ninety-nine thousand, eight hundred fifty-three".