66940415168 has 112 divisors (see below), whose sum is σ = 146249867520. Its totient is φ = 30147609600.

The previous prime is 66940415167. The next prime is 66940415189. The reversal of 66940415168 is 86151404966.

It is not an unprimeable number, because it can be changed into a prime (66940415167) 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, 43722563 + ... + 43724093.

Almost surely, 2^66940415168 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 66940415168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73124933760).

66940415168 is an abundant number, since it is smaller than the sum of its proper divisors (79309452352).

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

66940415168 is a wasteful number, since it uses less digits than its factorization.

66940415168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2086 (or 2076 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 50.

The spelling of 66940415168 in words is "sixty-six billion, nine hundred forty million, four hundred fifteen thousand, one hundred sixty-eight".