6857959631389 has 2 divisors, whose sum is σ = 6857959631390. Its totient is φ = 6857959631388.

The previous prime is 6857959631317. The next prime is 6857959631461. The reversal of 6857959631389 is 9831369597586.

It is a balanced prime because it is at equal distance from previous prime (6857959631317) and next prime (6857959631461).

It can be written as a sum of positive squares in only one way, i.e., 5433290607364 + 1424669024025 = 2330942^2 + 1193595^2 .

It is a cyclic number.

It is not a de Polignac number, because 6857959631389 - 2⁷ = 6857959631261 is a prime.

It is a super-2 number, since 2×6857959631389² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6857959632389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3428979815694 + 3428979815695.

It is an arithmetic number, because the mean of its divisors is an integer number (3428979815695).

Almost surely, 2^{6857959631389} is an apocalyptic number.

It is an amenable number.

6857959631389 is a deficient number, since it is larger than the sum of its proper divisors (1).

6857959631389 is an equidigital number, since it uses as much as digits as its factorization.

6857959631389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2645395200, while the sum is 79.

The spelling of 6857959631389 in words is "six trillion, eight hundred fifty-seven billion, nine hundred fifty-nine million, six hundred thirty-one thousand, three hundred eighty-nine".