66988852992 has 216 divisors, whose sum is σ = 203204055600. Its totient is φ = 21192966144.

The previous prime is 66988852897. The next prime is 66988852993. The reversal of 66988852992 is 29925888966.

66988852992 is a `hidden beast` number, since 6 + 6 + 9 + 8 + 8 + 8 + 529 + 92 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 66988852992.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66988852993) 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, 3933648 + ... + 3950640.

Almost surely, 2^66988852992 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 66988852992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101602027800).

66988852992 is an abundant number, since it is smaller than the sum of its proper divisors (136215202608).

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

66988852992 is a wasteful number, since it uses less digits than its factorization.

66988852992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17103 (or 17086 counting only the distinct ones).

The product of its digits is 268738560, while the sum is 72.

The spelling of 66988852992 in words is "sixty-six billion, nine hundred eighty-eight million, eight hundred fifty-two thousand, nine hundred ninety-two".