66686051790 has 80 divisors (see below), whose sum is σ = 181160168112. Its totient is φ = 17599597056.

The previous prime is 66686051777. The next prime is 66686051801. The reversal of 66686051790 is 9715068666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 345804 + ... + 502943.

Almost surely, 2^66686051790 is an apocalyptic number.

66686051790 is an abundant number, since it is smaller than the sum of its proper divisors (114474116322).

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

66686051790 is a wasteful number, since it uses less digits than its factorization.

66686051790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848863 (or 848854 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 66686051790 in words is "sixty-six billion, six hundred eighty-six million, fifty-one thousand, seven hundred ninety".