66829903616 has 216 divisors, whose sum is σ = 158957922816. Its totient is φ = 27952404480.

The previous prime is 66829903579. The next prime is 66829903703. The reversal of 66829903616 is 61630992866.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 110098385 + ... + 110098991.

Almost surely, 2^66829903616 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 66829903616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79478961408).

66829903616 is an abundant number, since it is smaller than the sum of its proper divisors (92128019200).

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

66829903616 is a wasteful number, since it uses less digits than its factorization.

66829903616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835 (or 814 counting only the distinct ones).

The product of its (nonzero) digits is 5038848, while the sum is 56.

The spelling of 66829903616 in words is "sixty-six billion, eight hundred twenty-nine million, nine hundred three thousand, six hundred sixteen".