66665529504 has 72 divisors (see below), whose sum is σ = 216662977440. Its totient is φ = 19047293568.

The previous prime is 66665529457. The next prime is 66665529517. The reversal of 66665529504 is 40592556666.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16532094 + ... + 16536125.

It is an arithmetic number, because the mean of its divisors is an integer number (3009208020).

Almost surely, 2^66665529504 is an apocalyptic number.

It is an amenable number.

66665529504 is an abundant number, since it is smaller than the sum of its proper divisors (149997447936).

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

66665529504 is a wasteful number, since it uses less digits than its factorization.

66665529504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33068242 (or 33068231 counting only the distinct ones).

The product of its (nonzero) digits is 11664000, while the sum is 54.

The spelling of 66665529504 in words is "sixty-six billion, six hundred sixty-five million, five hundred twenty-nine thousand, five hundred four".