66798115776 has 1120 divisors, whose sum is σ = 260230924800. Its totient is φ = 16482631680.

The previous prime is 66798115687. The next prime is 66798115781. The reversal of 66798115776 is 67751189766.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 480561915 + ... + 480562053.

It is an arithmetic number, because the mean of its divisors is an integer number (232349040).

Almost surely, 2^66798115776 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 66798115776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130115462400).

66798115776 is an abundant number, since it is smaller than the sum of its proper divisors (193432809024).

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

66798115776 is a wasteful number, since it uses less digits than its factorization.

66798115776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247 (or 228 counting only the distinct ones).

The product of its digits is 26671680, while the sum is 63.

The spelling of 66798115776 in words is "sixty-six billion, seven hundred ninety-eight million, one hundred fifteen thousand, seven hundred seventy-six".