861646029973 has 2 divisors, whose sum is σ = 861646029974. Its totient is φ = 861646029972.

The previous prime is 861646029947. The next prime is 861646030009. The reversal of 861646029973 is 379920646168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 834405517764 + 27240512209 = 913458^2 + 165047^2 .

It is a cyclic number.

It is not a de Polignac number, because 861646029973 - 2¹³ = 861646021781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861646029173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430823014986 + 430823014987.

It is an arithmetic number, because the mean of its divisors is an integer number (430823014987).

Almost surely, 2^861646029973 is an apocalyptic number.

It is an amenable number.

861646029973 is a deficient number, since it is larger than the sum of its proper divisors (1).

861646029973 is an equidigital number, since it uses as much as digits as its factorization.

861646029973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23514624, while the sum is 61.

The spelling of 861646029973 in words is "eight hundred sixty-one billion, six hundred forty-six million, twenty-nine thousand, nine hundred seventy-three".