66722698944 has 588 divisors, whose sum is σ = 223314694848. Its totient is φ = 19748551680.

The previous prime is 66722698871. The next prime is 66722698949. The reversal of 66722698944 is 44989622766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66722698949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 299204817 + ... + 299205039.

It is an arithmetic number, because the mean of its divisors is an integer number (379786896).

Almost surely, 2^66722698944 is an apocalyptic number.

66722698944 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66722698944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111657347424).

66722698944 is an abundant number, since it is smaller than the sum of its proper divisors (156591995904).

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

66722698944 is a wasteful number, since it uses less digits than its factorization.

66722698944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328 (or 292 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 63.

The spelling of 66722698944 in words is "sixty-six billion, seven hundred twenty-two million, six hundred ninety-eight thousand, nine hundred forty-four".