66662105172 has 96 divisors (see below), whose sum is σ = 168792446592. Its totient is φ = 20354720256.

The previous prime is 66662105099. The next prime is 66662105183. The reversal of 66662105172 is 27150126666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29070858 + ... + 29073150.

It is an arithmetic number, because the mean of its divisors is an integer number (1758254652).

Almost surely, 2^66662105172 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 66662105172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84396223296).

66662105172 is an abundant number, since it is smaller than the sum of its proper divisors (102130341420).

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

66662105172 is a wasteful number, since it uses less digits than its factorization.

66662105172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3657 (or 3655 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 66662105172 in words is "sixty-six billion, six hundred sixty-two million, one hundred five thousand, one hundred seventy-two".