806166683881 has 8 divisors (see below), whose sum is σ = 869404028360. Its totient is φ = 743104271232.

The previous prime is 806166683867. The next prime is 806166683887. The reversal of 806166683881 is 188386661608.

It can be written as a sum of positive squares in 4 ways, for example, as 96933218281 + 709233465600 = 311341^2 + 842160^2 .

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 806166683881 - 2¹³ = 806166675689 is a prime.

It is a super-2 number, since 2×806166683881² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (806166683887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43723380 + ... + 43741813.

It is an arithmetic number, because the mean of its divisors is an integer number (108675503545).

Almost surely, 2^806166683881 is an apocalyptic number.

It is an amenable number.

806166683881 is a deficient number, since it is larger than the sum of its proper divisors (63237344479).

806166683881 is a wasteful number, since it uses less digits than its factorization.

806166683881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87465915.

The product of its (nonzero) digits is 15925248, while the sum is 61.

The spelling of 806166683881 in words is "eight hundred six billion, one hundred sixty-six million, six hundred eighty-three thousand, eight hundred eighty-one".