642066666200 has 96 divisors (see below), whose sum is σ = 1530662812560. Its totient is φ = 250375257600.

The previous prime is 642066666181. The next prime is 642066666223. The reversal of 642066666200 is 2666660246.

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, 1471295 + ... + 1857105.

Almost surely, 2^642066666200 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 642066666200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (765331406280).

642066666200 is an abundant number, since it is smaller than the sum of its proper divisors (888596146360).

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

642066666200 is a wasteful number, since it uses less digits than its factorization.

642066666200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386037 (or 386028 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 44.

The spelling of 642066666200 in words is "six hundred forty-two billion, sixty-six million, six hundred sixty-six thousand, two hundred".