812505029877461 has 2 divisors, whose sum is σ = 812505029877462. Its totient is φ = 812505029877460.

The previous prime is 812505029877449. The next prime is 812505029877491. The reversal of 812505029877461 is 164778920505218.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 488998258023025 + 323506771854436 = 22113305^2 + 17986294^2 .

It is a cyclic number.

It is not a de Polignac number, because 812505029877461 - 2⁶ = 812505029877397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812505029877491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406252514938730 + 406252514938731.

It is an arithmetic number, because the mean of its divisors is an integer number (406252514938731).

Almost surely, 2^{812505029877461} is an apocalyptic number.

It is an amenable number.

812505029877461 is a deficient number, since it is larger than the sum of its proper divisors (1).

812505029877461 is an equidigital number, since it uses as much as digits as its factorization.

812505029877461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 67737600, while the sum is 65.

The spelling of 812505029877461 in words is "eight hundred twelve trillion, five hundred five billion, twenty-nine million, eight hundred seventy-seven thousand, four hundred sixty-one".