6711921857 has 2 divisors, whose sum is σ = 6711921858. Its totient is φ = 6711921856.

The previous prime is 6711921761. The next prime is 6711921859. The reversal of 6711921857 is 7581291176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4844299201 + 1867622656 = 69601^2 + 43216^2 .

It is a cyclic number.

It is not a de Polignac number, because 6711921857 - 2¹² = 6711917761 is a prime.

Together with 6711921859, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6711921859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3355960928 + 3355960929.

It is an arithmetic number, because the mean of its divisors is an integer number (3355960929).

Almost surely, 2^6711921857 is an apocalyptic number.

It is an amenable number.

6711921857 is a deficient number, since it is larger than the sum of its proper divisors (1).

6711921857 is an equidigital number, since it uses as much as digits as its factorization.

6711921857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 47.

The square root of 6711921857 is about 81926.3196842138. The cubic root of 6711921857 is about 1886.3211340388.

The spelling of 6711921857 in words is "six billion, seven hundred eleven million, nine hundred twenty-one thousand, eight hundred fifty-seven".