66894172992 has 168 divisors, whose sum is σ = 200405512320. Its totient is φ = 21293521920.

The previous prime is 66894172991. The next prime is 66894172999. The reversal of 66894172992 is 29927149866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66894172991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8753109 + ... + 8760747.

Almost surely, 2^66894172992 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 66894172992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100202756160).

66894172992 is an abundant number, since it is smaller than the sum of its proper divisors (133511339328).

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

66894172992 is a wasteful number, since it uses less digits than its factorization.

66894172992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8341 (or 8328 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 63.

The spelling of 66894172992 in words is "sixty-six billion, eight hundred ninety-four million, one hundred seventy-two thousand, nine hundred ninety-two".