66531340 has 12 divisors (see below), whose sum is σ = 139715856. Its totient is φ = 26612528.

The previous prime is 66531329. The next prime is 66531343. The reversal of 66531340 is 4313566.

66531340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 66531299 and 66531308.

It is not an unprimeable number, because it can be changed into a prime (66531343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1663264 + ... + 1663303.

It is an arithmetic number, because the mean of its divisors is an integer number (11642988).

Almost surely, 2^66531340 is an apocalyptic number.

It is an amenable number.

66531340 is an abundant number, since it is smaller than the sum of its proper divisors (73184516).

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

66531340 is a wasteful number, since it uses less digits than its factorization.

66531340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3326576 (or 3326574 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 66531340 is about 8156.6745674938. The cubic root of 66531340 is about 405.2055858125.

The spelling of 66531340 in words is "sixty-six million, five hundred thirty-one thousand, three hundred forty".