661110563166 has 32 divisors (see below), whose sum is σ = 1336547174400. Its totient is φ = 217995316704.

The previous prime is 661110563161. The next prime is 661110563209. The reversal of 661110563166 is 661365011166.

661110563166 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661110563161) 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, 1393710 + ... + 1806833.

It is an arithmetic number, because the mean of its divisors is an integer number (41767099200).

Almost surely, 2^661110563166 is an apocalyptic number.

661110563166 is an abundant number, since it is smaller than the sum of its proper divisors (675436611234).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661110563166 is a wasteful number, since it uses less digits than its factorization.

661110563166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3200920.

The product of its (nonzero) digits is 116640, while the sum is 42.

The spelling of 661110563166 in words is "six hundred sixty-one billion, one hundred ten million, five hundred sixty-three thousand, one hundred sixty-six".