66665605100 has 18 divisors (see below), whose sum is σ = 144664363284. Its totient is φ = 26666242000.

The previous prime is 66665605081. The next prime is 66665605103. The reversal of 66665605100 is 150656666.

It is not an unprimeable number, because it can be changed into a prime (66665605103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 333327926 + ... + 333328125.

Almost surely, 2^66665605100 is an apocalyptic number.

It is an amenable number.

66665605100 is an abundant number, since it is smaller than the sum of its proper divisors (77998758184).

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

66665605100 is a wasteful number, since it uses less digits than its factorization.

66665605100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666656065 (or 666656058 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 41.

The spelling of 66665605100 in words is "sixty-six billion, six hundred sixty-five million, six hundred five thousand, one hundred".