66532661 has 12 divisors (see below), whose sum is σ = 75625452. Its totient is φ = 58178304.

The previous prime is 66532607. The next prime is 66532681. The reversal of 66532661 is 16623566.

It can be written as a sum of positive squares in 2 ways, for example, as 43970161 + 22562500 = 6631^2 + 4750^2 .

It is not a de Polignac number, because 66532661 - 2⁶ = 66532597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66532681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2396 + ... + 11781.

It is an arithmetic number, because the mean of its divisors is an integer number (6302121).

Almost surely, 2^66532661 is an apocalyptic number.

It is an amenable number.

66532661 is a deficient number, since it is larger than the sum of its proper divisors (9092791).

66532661 is a wasteful number, since it uses less digits than its factorization.

66532661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14228 (or 14209 counting only the distinct ones).

The product of its digits is 38880, while the sum is 35.

The square root of 66532661 is about 8156.7555437196. The cubic root of 66532661 is about 405.2082676215.

The spelling of 66532661 in words is "sixty-six million, five hundred thirty-two thousand, six hundred sixty-one".