6620251361 has 2 divisors, whose sum is σ = 6620251362. Its totient is φ = 6620251360.

The previous prime is 6620251327. The next prime is 6620251387. The reversal of 6620251361 is 1631520266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5983950736 + 636300625 = 77356^2 + 25225^2 .

It is a cyclic number.

It is not a de Polignac number, because 6620251361 - 2¹⁰ = 6620250337 is a prime.

It is not a weakly prime, because it can be changed into another prime (6620251321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3310125680 + 3310125681.

It is an arithmetic number, because the mean of its divisors is an integer number (3310125681).

Almost surely, 2^6620251361 is an apocalyptic number.

It is an amenable number.

6620251361 is a deficient number, since it is larger than the sum of its proper divisors (1).

6620251361 is an equidigital number, since it uses as much as digits as its factorization.

6620251361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 6620251361 is about 81364.9270939267. The cubic root of 6620251361 is about 1877.6940341296.

The spelling of 6620251361 in words is "six billion, six hundred twenty million, two hundred fifty-one thousand, three hundred sixty-one".