66540472 has 32 divisors (see below), whose sum is σ = 131489280. Its totient is φ = 31505760.

The previous prime is 66540469. The next prime is 66540473. The reversal of 66540472 is 27404566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66540473) 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, 17197 + ... + 20707.

It is an arithmetic number, because the mean of its divisors is an integer number (4109040).

Almost surely, 2^66540472 is an apocalyptic number.

It is an amenable number.

66540472 is a deficient number, since it is larger than the sum of its proper divisors (64948808).

66540472 is a wasteful number, since it uses less digits than its factorization.

66540472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3643 (or 3639 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 66540472 is about 8157.2343352389. The cubic root of 66540472 is about 405.2241242844.

The spelling of 66540472 in words is "sixty-six million, five hundred forty thousand, four hundred seventy-two".