166561510116 has 48 divisors (see below), whose sum is σ = 391403779200. Its totient is φ = 55126471680.

The previous prime is 166561510097. The next prime is 166561510123. The reversal of 166561510116 is 611015165661.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4973620 + ... + 5006996.

It is an arithmetic number, because the mean of its divisors is an integer number (8154245400).

Almost surely, 2^166561510116 is an apocalyptic number.

It is an amenable number.

166561510116 is an abundant number, since it is smaller than the sum of its proper divisors (224842269084).

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

166561510116 is a wasteful number, since it uses less digits than its factorization.

166561510116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36324 (or 36322 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 39.

Adding to 166561510116 its reverse (611015165661), we get a palindrome (777576675777).

The spelling of 166561510116 in words is "one hundred sixty-six billion, five hundred sixty-one million, five hundred ten thousand, one hundred sixteen".