66457749 has 8 divisors (see below), whose sum is σ = 88728640. Its totient is φ = 44246016.

The previous prime is 66457693. The next prime is 66457751. The reversal of 66457749 is 94775466.

66457749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66457749 - 2⁷ = 66457621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66457698 and 66457707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66457789) 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, 12097 + ... + 16710.

It is an arithmetic number, because the mean of its divisors is an integer number (11091080).

Almost surely, 2^66457749 is an apocalyptic number.

It is an amenable number.

66457749 is a deficient number, since it is larger than the sum of its proper divisors (22270891).

66457749 is a wasteful number, since it uses less digits than its factorization.

66457749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29579.

The product of its digits is 1270080, while the sum is 48.

The square root of 66457749 is about 8152.1622285134. The cubic root of 66457749 is about 405.0561300043.

The spelling of 66457749 in words is "sixty-six million, four hundred fifty-seven thousand, seven hundred forty-nine".