66531156 has 24 divisors (see below), whose sum is σ = 155381184. Its totient is φ = 22156800.

The previous prime is 66531139. The next prime is 66531161. The reversal of 66531156 is 65113566.

It is a congruent number.

It is an unprimeable number.

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, 17481 + ... + 20943.

It is an arithmetic number, because the mean of its divisors is an integer number (6474216).

Almost surely, 2^66531156 is an apocalyptic number.

It is an amenable number.

66531156 is an abundant number, since it is smaller than the sum of its proper divisors (88850028).

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

66531156 is a wasteful number, since it uses less digits than its factorization.

66531156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5071 (or 5069 counting only the distinct ones).

The product of its digits is 16200, while the sum is 33.

The square root of 66531156 is about 8156.6632883796. The cubic root of 66531156 is about 405.2052122648.

The spelling of 66531156 in words is "sixty-six million, five hundred thirty-one thousand, one hundred fifty-six".