841666681 has 8 divisors (see below), whose sum is σ = 880475400. Its totient is φ = 803510400.

The previous prime is 841666673. The next prime is 841666687. The reversal of 841666681 is 186666148.

It can be written as a sum of positive squares in 4 ways, for example, as 107744400 + 733922281 = 10380^2 + 27091^2 .

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 841666681 - 2³ = 841666673 is a prime.

It is a super-2 number, since 2×841666681² = 1416805603811111522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (841666687) 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, 160470 + ... + 165631.

It is an arithmetic number, because the mean of its divisors is an integer number (110059425).

Almost surely, 2^841666681 is an apocalyptic number.

It is an amenable number.

841666681 is a deficient number, since it is larger than the sum of its proper divisors (38808719).

841666681 is a wasteful number, since it uses less digits than its factorization.

841666681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326219.

The product of its digits is 331776, while the sum is 46.

The square root of 841666681 is about 29011.4922229106. The cubic root of 841666681 is about 944.1624227519.

The spelling of 841666681 in words is "eight hundred forty-one million, six hundred sixty-six thousand, six hundred eighty-one".