66678687750 has 256 divisors, whose sum is σ = 180793866240. Its totient is φ = 16306073600.

The previous prime is 66678687749. The next prime is 66678687769. The reversal of 66678687750 is 5778687666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 103057927 + ... + 103058573.

It is an arithmetic number, because the mean of its divisors is an integer number (706226040).

Almost surely, 2^66678687750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66678687750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90396933120).

66678687750 is an abundant number, since it is smaller than the sum of its proper divisors (114115178490).

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

66678687750 is a wasteful number, since it uses less digits than its factorization.

66678687750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880 (or 870 counting only the distinct ones).

The product of its (nonzero) digits is 142248960, while the sum is 66.

The spelling of 66678687750 in words is "sixty-six billion, six hundred seventy-eight million, six hundred eighty-seven thousand, seven hundred fifty".