66664745 has 24 divisors (see below), whose sum is σ = 93965184. Its totient is φ = 45267936.

The previous prime is 66664733. The next prime is 66664751. The reversal of 66664745 is 54746666.

It is a de Polignac number, because none of the positive numbers 2^k-66664745 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66664696 and 66664705.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24944 + ... + 27486.

It is an arithmetic number, because the mean of its divisors is an integer number (3915216).

Almost surely, 2^66664745 is an apocalyptic number.

It is an amenable number.

66664745 is a deficient number, since it is larger than the sum of its proper divisors (27300439).

66664745 is a wasteful number, since it uses less digits than its factorization.

66664745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2669 (or 2662 counting only the distinct ones).

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

The square root of 66664745 is about 8164.8481308595. The cubic root of 66664745 is about 405.4762370125.

It can be divided in two parts, 6666 and 4745, that added together give a palindrome (11411).

The spelling of 66664745 in words is "sixty-six million, six hundred sixty-four thousand, seven hundred forty-five".