66778104600 has 288 divisors, whose sum is σ = 238014475920. Its totient is φ = 16720527360.

The previous prime is 66778104599. The next prime is 66778104649. The reversal of 66778104600 is 640187766.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 14287864 + ... + 14292536.

Almost surely, 2^66778104600 is an apocalyptic number.

66778104600 is a gapful number since it is divisible by the number (60) 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 66778104600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119007237960).

66778104600 is an abundant number, since it is smaller than the sum of its proper divisors (171236371320).

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

66778104600 is a wasteful number, since it uses less digits than its factorization.

66778104600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5179 (or 5167 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The spelling of 66778104600 in words is "sixty-six billion, seven hundred seventy-eight million, one hundred four thousand, six hundred".