866850081061 has 4 divisors (see below), whose sum is σ = 866858420332. Its totient is φ = 866841741792.

The previous prime is 866850081049. The next prime is 866850081077. The reversal of 866850081061 is 160180058668.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 613529124961 + 253320956100 = 783281^2 + 503310^2 .

It is a cyclic number.

It is not a de Polignac number, because 866850081061 - 2⁷ = 866850080933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 866850080996 and 866850081014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866850088061) 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 in 3 ways as a sum of consecutive naturals, for example, 4011720 + ... + 4222273.

It is an arithmetic number, because the mean of its divisors is an integer number (216714605083).

Almost surely, 2^866850081061 is an apocalyptic number.

It is an amenable number.

866850081061 is a deficient number, since it is larger than the sum of its proper divisors (8339271).

866850081061 is a wasteful number, since it uses less digits than its factorization.

866850081061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8339270.

The product of its (nonzero) digits is 552960, while the sum is 49.

The spelling of 866850081061 in words is "eight hundred sixty-six billion, eight hundred fifty million, eighty-one thousand, sixty-one".