861318604669 has 2 divisors, whose sum is σ = 861318604670. Its totient is φ = 861318604668.

The previous prime is 861318604651. The next prime is 861318604687. The reversal of 861318604669 is 966406813168.

It is a balanced prime because it is at equal distance from previous prime (861318604651) and next prime (861318604687).

It can be written as a sum of positive squares in only one way, i.e., 546361940569 + 314956664100 = 739163^2 + 561210^2 .

It is a cyclic number.

It is not a de Polignac number, because 861318604669 - 2¹¹ = 861318602621 is a prime.

It is a super-2 number, since 2×861318604669² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861318604649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430659302334 + 430659302335.

It is an arithmetic number, because the mean of its divisors is an integer number (430659302335).

Almost surely, 2^861318604669 is an apocalyptic number.

It is an amenable number.

861318604669 is a deficient number, since it is larger than the sum of its proper divisors (1).

861318604669 is an equidigital number, since it uses as much as digits as its factorization.

861318604669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8957952, while the sum is 58.

The spelling of 861318604669 in words is "eight hundred sixty-one billion, three hundred eighteen million, six hundred four thousand, six hundred sixty-nine".