66545532 has 36 divisors (see below), whose sum is σ = 175528080. Its totient is φ = 21217152.

The previous prime is 66545503. The next prime is 66545533. The reversal of 66545532 is 23554566.

It is a happy number.

66545532 is a `hidden beast` number, since 66 + 545 + 53 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66545533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39357 + ... + 41012.

It is an arithmetic number, because the mean of its divisors is an integer number (4875780).

Almost surely, 2^66545532 is an apocalyptic number.

It is an amenable number.

66545532 is an abundant number, since it is smaller than the sum of its proper divisors (108982548).

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

66545532 is a wasteful number, since it uses less digits than its factorization.

66545532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80402 (or 80397 counting only the distinct ones).

The product of its digits is 108000, while the sum is 36.

The square root of 66545532 is about 8157.5444834828. The cubic root of 66545532 is about 405.2343956377.

The spelling of 66545532 in words is "sixty-six million, five hundred forty-five thousand, five hundred thirty-two".