66457643 has 4 divisors (see below), whose sum is σ = 75951600. Its totient is φ = 56963688.

The previous prime is 66457639. The next prime is 66457691. The reversal of 66457643 is 34675466.

66457643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66457643 - 2² = 66457639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66457643.

It is not an unprimeable number, because it can be changed into a prime (66457613) 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, 4746968 + ... + 4746981.

It is an arithmetic number, because the mean of its divisors is an integer number (18987900).

Almost surely, 2^66457643 is an apocalyptic number.

66457643 is a deficient number, since it is larger than the sum of its proper divisors (9493957).

66457643 is an equidigital number, since it uses as much as digits as its factorization.

66457643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9493956.

The product of its digits is 362880, while the sum is 41.

The square root of 66457643 is about 8152.1557271681. The cubic root of 66457643 is about 405.0559146496.

The spelling of 66457643 in words is "sixty-six million, four hundred fifty-seven thousand, six hundred forty-three".