66745646 has 32 divisors (see below), whose sum is σ = 113724000. Its totient is φ = 29102080.

The previous prime is 66745633. The next prime is 66745667. The reversal of 66745646 is 64654766.

It is a junction number, because it is equal to n+sod(n) for n = 66745597 and 66745606.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 148430 + ... + 148878.

It is an arithmetic number, because the mean of its divisors is an integer number (3553875).

Almost surely, 2^66745646 is an apocalyptic number.

66745646 is a deficient number, since it is larger than the sum of its proper divisors (46978354).

66745646 is a wasteful number, since it uses less digits than its factorization.

66745646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724.

The product of its digits is 725760, while the sum is 44.

The square root of 66745646 is about 8169.8008543660. The cubic root of 66745646 is about 405.6401926008.

The spelling of 66745646 in words is "sixty-six million, seven hundred forty-five thousand, six hundred forty-six".