66631544 has 32 divisors (see below), whose sum is σ = 143095680. Its totient is φ = 28493664.

The previous prime is 66631489. The next prime is 66631549. The reversal of 66631544 is 44513666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66631549) 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 7 ways as a sum of consecutive naturals, for example, 31859 + ... + 33885.

It is an arithmetic number, because the mean of its divisors is an integer number (4471740).

Almost surely, 2^66631544 is an apocalyptic number.

It is an amenable number.

66631544 is an abundant number, since it is smaller than the sum of its proper divisors (76464136).

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

66631544 is a wasteful number, since it uses less digits than its factorization.

66631544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2627 (or 2623 counting only the distinct ones).

The product of its digits is 51840, while the sum is 35.

The square root of 66631544 is about 8162.8147106253. The cubic root of 66631544 is about 405.4089128118.

The spelling of 66631544 in words is "sixty-six million, six hundred thirty-one thousand, five hundred forty-four".