6856641562651 has 2 divisors, whose sum is σ = 6856641562652. Its totient is φ = 6856641562650.

The previous prime is 6856641562543. The next prime is 6856641562663. The reversal of 6856641562651 is 1562651466586.

6856641562651 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6856641562651 - 2⁹ = 6856641562139 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6856641562651.

It is not a weakly prime, because it can be changed into another prime (6856641562751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3428320781325 + 3428320781326.

It is an arithmetic number, because the mean of its divisors is an integer number (3428320781326).

Almost surely, 2^{6856641562651} is an apocalyptic number.

6856641562651 is a deficient number, since it is larger than the sum of its proper divisors (1).

6856641562651 is an equidigital number, since it uses as much as digits as its factorization.

6856641562651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208000, while the sum is 61.

The spelling of 6856641562651 in words is "six trillion, eight hundred fifty-six billion, six hundred forty-one million, five hundred sixty-two thousand, six hundred fifty-one".