66457750 has 16 divisors (see below), whose sum is σ = 124409376. Its totient is φ = 26583000.

The previous prime is 66457693. The next prime is 66457751. The reversal of 66457750 is 5775466.

It is a happy number.

66457750 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66457751) 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 7 ways as a sum of consecutive naturals, for example, 132666 + ... + 133165.

It is an arithmetic number, because the mean of its divisors is an integer number (7775586).

Almost surely, 2^66457750 is an apocalyptic number.

66457750 is a deficient number, since it is larger than the sum of its proper divisors (57951626).

66457750 is a wasteful number, since it uses less digits than its factorization.

66457750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265848 (or 265838 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 40.

The square root of 66457750 is about 8152.1622898468. The cubic root of 66457750 is about 405.0561320360.

The spelling of 66457750 in words is "sixty-six million, four hundred fifty-seven thousand, seven hundred fifty".