665606066100 has 72 divisors (see below), whose sum is σ = 1926885192288. Its totient is φ = 177396796800.

The previous prime is 665606066093. The next prime is 665606066129. The reversal of 665606066100 is 1660606566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69259 + ... + 1155858.

Almost surely, 2^665606066100 is an apocalyptic number.

665606066100 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

665606066100 is an abundant number, since it is smaller than the sum of its proper divisors (1261279126188).

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

665606066100 is a wasteful number, since it uses less digits than its factorization.

665606066100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1226945 (or 1226938 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 42.

The spelling of 665606066100 in words is "six hundred sixty-five billion, six hundred six million, sixty-six thousand, one hundred".