6857579128321 has 2 divisors, whose sum is σ = 6857579128322. Its totient is φ = 6857579128320.

The previous prime is 6857579128277. The next prime is 6857579128331. The reversal of 6857579128321 is 1238219757586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3912923128321 + 2944656000000 = 1978111^2 + 1716000^2 .

It is a cyclic number.

It is not a de Polignac number, because 6857579128321 - 2⁷ = 6857579128193 is a prime.

It is not a weakly prime, because it can be changed into another prime (6857579128331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3428789564160 + 3428789564161.

It is an arithmetic number, because the mean of its divisors is an integer number (3428789564161).

Almost surely, 2^{6857579128321} is an apocalyptic number.

It is an amenable number.

6857579128321 is a deficient number, since it is larger than the sum of its proper divisors (1).

6857579128321 is an equidigital number, since it uses as much as digits as its factorization.

6857579128321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50803200, while the sum is 64.

The spelling of 6857579128321 in words is "six trillion, eight hundred fifty-seven billion, five hundred seventy-nine million, one hundred twenty-eight thousand, three hundred twenty-one".