861646430101 has 2 divisors, whose sum is σ = 861646430102. Its totient is φ = 861646430100.

The previous prime is 861646430087. The next prime is 861646430167. The reversal of 861646430101 is 101034646168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 826051947876 + 35594482225 = 908874^2 + 188665^2 .

It is a cyclic number.

It is not a de Polignac number, because 861646430101 - 2⁵ = 861646430069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861646430191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430823215050 + 430823215051.

It is an arithmetic number, because the mean of its divisors is an integer number (430823215051).

Almost surely, 2^861646430101 is an apocalyptic number.

It is an amenable number.

861646430101 is a deficient number, since it is larger than the sum of its proper divisors (1).

861646430101 is an equidigital number, since it uses as much as digits as its factorization.

861646430101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 861646430101 in words is "eight hundred sixty-one billion, six hundred forty-six million, four hundred thirty thousand, one hundred one".