66969607896 has 128 divisors (see below), whose sum is σ = 192772440000. Its totient is φ = 21516364800.

The previous prime is 66969607877. The next prime is 66969607961. The reversal of 66969607896 is 69870696966.

It is a happy number.

66969607896 is a `hidden beast` number, since 6 + 6 + 9 + 6 + 9 + 607 + 8 + 9 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

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, 3755770 + ... + 3773558.

Almost surely, 2^66969607896 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 66969607896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96386220000).

66969607896 is an abundant number, since it is smaller than the sum of its proper divisors (125802832104).

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

66969607896 is a wasteful number, since it uses less digits than its factorization.

66969607896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18434 (or 18424 counting only the distinct ones).

The product of its (nonzero) digits is 317447424, while the sum is 72.

The spelling of 66969607896 in words is "sixty-six billion, nine hundred sixty-nine million, six hundred seven thousand, eight hundred ninety-six".