866831443217461 has 2 divisors, whose sum is σ = 866831443217462. Its totient is φ = 866831443217460.

The previous prime is 866831443217419. The next prime is 866831443217471. The reversal of 866831443217461 is 164712344138668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 569258800131025 + 297572643086436 = 23859145^2 + 17250294^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866831443217461 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 866831443217393 and 866831443217402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866831443217471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433415721608730 + 433415721608731.

It is an arithmetic number, because the mean of its divisors is an integer number (433415721608731).

Almost surely, 2^{866831443217461} is an apocalyptic number.

It is an amenable number.

866831443217461 is a deficient number, since it is larger than the sum of its proper divisors (1).

866831443217461 is an equidigital number, since it uses as much as digits as its factorization.

866831443217461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 111476736, while the sum is 64.

The spelling of 866831443217461 in words is "eight hundred sixty-six trillion, eight hundred thirty-one billion, four hundred forty-three million, two hundred seventeen thousand, four hundred sixty-one".