66779019200 has 168 divisors, whose sum is σ = 179985466800. Its totient is φ = 24273141760.

The previous prime is 66779019169. The next prime is 66779019211. The reversal of 66779019200 is 291097766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 746471 + ... + 831129.

Almost surely, 2^66779019200 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 66779019200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89992733400).

66779019200 is an abundant number, since it is smaller than the sum of its proper divisors (113206447600).

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

66779019200 is a wasteful number, since it uses less digits than its factorization.

66779019200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84727 (or 84712 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 47.

The spelling of 66779019200 in words is "sixty-six billion, seven hundred seventy-nine million, nineteen thousand, two hundred".