8104661861 has 4 divisors (see below), whose sum is σ = 8105056224. Its totient is φ = 8104267500.

The previous prime is 8104661809. The next prime is 8104661863. The reversal of 8104661861 is 1681664018.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8104661861 - 2²⁶ = 8037552997 is a prime.

It is a super-2 number, since 2×8104661861² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8104661863) 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, 164555 + ... + 208056.

It is an arithmetic number, because the mean of its divisors is an integer number (2026264056).

Almost surely, 2^8104661861 is an apocalyptic number.

It is an amenable number.

8104661861 is a deficient number, since it is larger than the sum of its proper divisors (394363).

8104661861 is a wasteful number, since it uses less digits than its factorization.

8104661861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394362.

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 8104661861 is about 90025.8955023498. The cubic root of 8104661861 is about 2008.6840607205.

The spelling of 8104661861 in words is "eight billion, one hundred four million, six hundred sixty-one thousand, eight hundred sixty-one".