6620857 has 2 divisors, whose sum is σ = 6620858. Its totient is φ = 6620856.

The previous prime is 6620851. The next prime is 6620863. The reversal of 6620857 is 7580266.

It is a balanced prime because it is at equal distance from previous prime (6620851) and next prime (6620863).

It can be written as a sum of positive squares in only one way, i.e., 6610041 + 10816 = 2571^2 + 104^2 .

It is a cyclic number.

It is not a de Polignac number, because 6620857 - 2¹¹ = 6618809 is a prime.

It is not a weakly prime, because it can be changed into another prime (6620851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3310428 + 3310429.

It is an arithmetic number, because the mean of its divisors is an integer number (3310429).

Almost surely, 2^6620857 is an apocalyptic number.

It is an amenable number.

6620857 is a deficient number, since it is larger than the sum of its proper divisors (1).

6620857 is an equidigital number, since it uses as much as digits as its factorization.

6620857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 6620857 is about 2573.1026019185. The cubic root of 6620857 is about 187.7751291274.

The spelling of 6620857 in words is "six million, six hundred twenty thousand, eight hundred fifty-seven".