66665532 has 12 divisors (see below), whose sum is σ = 155552936. Its totient is φ = 22221840.

The previous prime is 66665513. The next prime is 66665537. The reversal of 66665532 is 23556666.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66665537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2777719 + ... + 2777742.

Almost surely, 2^66665532 is an apocalyptic number.

It is an amenable number.

66665532 is an abundant number, since it is smaller than the sum of its proper divisors (88887404).

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

66665532 is a wasteful number, since it uses less digits than its factorization.

66665532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5555468 (or 5555466 counting only the distinct ones).

The product of its digits is 194400, while the sum is 39.

The square root of 66665532 is about 8164.8963251226. The cubic root of 66665532 is about 405.4778326012.

The spelling of 66665532 in words is "sixty-six million, six hundred sixty-five thousand, five hundred thirty-two".