66699316992 has 1152 divisors, whose sum is σ = 254306304000. Its totient is φ = 14987427840.

The previous prime is 66699316967. The next prime is 66699316993. The reversal of 66699316992 is 29961399666.

66699316992 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66699316993) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 749430484 + ... + 749430572.

It is an arithmetic number, because the mean of its divisors is an integer number (220752000).

Almost surely, 2^66699316992 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 66699316992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127153152000).

66699316992 is an abundant number, since it is smaller than the sum of its proper divisors (187606987008).

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

66699316992 is a wasteful number, since it uses less digits than its factorization.

66699316992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 183 counting only the distinct ones).

The product of its digits is 51018336, while the sum is 66.

The spelling of 66699316992 in words is "sixty-six billion, six hundred ninety-nine million, three hundred sixteen thousand, nine hundred ninety-two".