66557106112 has 84 divisors (see below), whose sum is σ = 153812650464. Its totient is φ = 28491939840.

The previous prime is 66557106089. The next prime is 66557106131. The reversal of 66557106112 is 21160175566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2845248 + ... + 2868544.

Almost surely, 2^66557106112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66557106112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76906325232).

66557106112 is an abundant number, since it is smaller than the sum of its proper divisors (87255544352).

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

66557106112 is a wasteful number, since it uses less digits than its factorization.

66557106112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24234 (or 24217 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 40.

The spelling of 66557106112 in words is "sixty-six billion, five hundred fifty-seven million, one hundred six thousand, one hundred twelve".