66111929228928 has 512 divisors, whose sum is σ = 194680237086720. Its totient is φ = 19712404275200.

The previous prime is 66111929228909. The next prime is 66111929228957. The reversal of 66111929228928 is 82982292911166.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 48151440850 + ... + 48151442222.

It is an arithmetic number, because the mean of its divisors is an integer number (380234838060).

Almost surely, 2^{66111929228928} 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 66111929228928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97340118543360).

66111929228928 is an abundant number, since it is smaller than the sum of its proper divisors (128568307857792).

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

66111929228928 is a wasteful number, since it uses less digits than its factorization.

66111929228928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2208 (or 2196 counting only the distinct ones).

The product of its digits is 26873856, while the sum is 66.

The spelling of 66111929228928 in words is "sixty-six trillion, one hundred eleven billion, nine hundred twenty-nine million, two hundred twenty-eight thousand, nine hundred twenty-eight".