8661872345806 has 32 divisors (see below), whose sum is σ = 13339185219360. Its totient is φ = 4215952281600.

The previous prime is 8661872345803. The next prime is 8661872345831. The reversal of 8661872345806 is 6085432781668.

It is a happy number.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8661872345803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100783180 + ... + 100869088.

It is an arithmetic number, because the mean of its divisors is an integer number (416849538105).

Almost surely, 2^{8661872345806} is an apocalyptic number.

8661872345806 is a deficient number, since it is larger than the sum of its proper divisors (4677312873554).

8661872345806 is a wasteful number, since it uses less digits than its factorization.

8661872345806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88660.

The product of its (nonzero) digits is 92897280, while the sum is 64.

The spelling of 8661872345806 in words is "eight trillion, six hundred sixty-one billion, eight hundred seventy-two million, three hundred forty-five thousand, eight hundred six".