66828469776 has 20 divisors (see below), whose sum is σ = 172640213712. Its totient is φ = 22276156576.

The previous prime is 66828469699. The next prime is 66828469781. The reversal of 66828469776 is 67796482866.

It is a self number, because there is not a number n which added to its sum of digits gives 66828469776.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 696129846 + ... + 696129941.

Almost surely, 2^66828469776 is an apocalyptic number.

It is an amenable number.

66828469776 is an abundant number, since it is smaller than the sum of its proper divisors (105811743936).

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

66828469776 is a wasteful number, since it uses less digits than its factorization.

66828469776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392259798 (or 1392259792 counting only the distinct ones).

The product of its digits is 292626432, while the sum is 69.

The spelling of 66828469776 in words is "sixty-six billion, eight hundred twenty-eight million, four hundred sixty-nine thousand, seven hundred seventy-six".