66457443 has 16 divisors (see below), whose sum is σ = 95916800. Its totient is φ = 40686624.

The previous prime is 66457441. The next prime is 66457453. The reversal of 66457443 is 34475466.

It is a happy number.

It is not a de Polignac number, because 66457443 - 2¹ = 66457441 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66457441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3480 + ... + 12042.

It is an arithmetic number, because the mean of its divisors is an integer number (5994800).

Almost surely, 2^66457443 is an apocalyptic number.

66457443 is a deficient number, since it is larger than the sum of its proper divisors (29459357).

66457443 is a wasteful number, since it uses less digits than its factorization.

66457443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8778.

The product of its digits is 241920, while the sum is 39.

The square root of 66457443 is about 8152.1434604649. The cubic root of 66457443 is about 405.0555083193.

The spelling of 66457443 in words is "sixty-six million, four hundred fifty-seven thousand, four hundred forty-three".