805661071085 has 8 divisors (see below), whose sum is σ = 1041161999640. Its totient is φ = 594949713984.

The previous prime is 805661071031. The next prime is 805661071109. The reversal of 805661071085 is 580170166508.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 12530115844 + 793130955241 = 111938^2 + 890579^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 805661071085 - 2²⁶ = 805593962221 is a prime.

It is a super-2 number, since 2×805661071085² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6197392790 + ... + 6197392919.

It is an arithmetic number, because the mean of its divisors is an integer number (130145249955).

Almost surely, 2^805661071085 is an apocalyptic number.

It is an amenable number.

805661071085 is a deficient number, since it is larger than the sum of its proper divisors (235500928555).

805661071085 is a wasteful number, since it uses less digits than its factorization.

805661071085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12394785727.

The product of its (nonzero) digits is 403200, while the sum is 47.

The spelling of 805661071085 in words is "eight hundred five billion, six hundred sixty-one million, seventy-one thousand, eighty-five".