861318604651 has 2 divisors, whose sum is σ = 861318604652. Its totient is φ = 861318604650.

The previous prime is 861318604649. The next prime is 861318604669. The reversal of 861318604651 is 156406813168.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861318604651 - 2¹ = 861318604649 is a prime.

Together with 861318604649, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 861318604595 and 861318604604.

It is not a weakly prime, because it can be changed into another prime (861318604691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430659302325 + 430659302326.

It is an arithmetic number, because the mean of its divisors is an integer number (430659302326).

Almost surely, 2^861318604651 is an apocalyptic number.

861318604651 is a deficient number, since it is larger than the sum of its proper divisors (1).

861318604651 is an equidigital number, since it uses as much as digits as its factorization.

861318604651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 829440, while the sum is 49.

The spelling of 861318604651 in words is "eight hundred sixty-one billion, three hundred eighteen million, six hundred four thousand, six hundred fifty-one".