66685652 has 12 divisors (see below), whose sum is σ = 127309056. Its totient is φ = 30311640.

The previous prime is 66685637. The next prime is 66685693. The reversal of 66685652 is 25658666.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 1515583 = 66685652 / (6 + 6 + 6 + 8 + 5 + 6 + 5 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 757748 + ... + 757835.

It is an arithmetic number, because the mean of its divisors is an integer number (10609088).

Almost surely, 2^66685652 is an apocalyptic number.

It is an amenable number.

66685652 is a deficient number, since it is larger than the sum of its proper divisors (60623404).

66685652 is a wasteful number, since it uses less digits than its factorization.

66685652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515598 (or 1515596 counting only the distinct ones).

The product of its digits is 518400, while the sum is 44.

The square root of 66685652 is about 8166.1283359986. The cubic root of 66685652 is about 405.5186202624.

The spelling of 66685652 in words is "sixty-six million, six hundred eighty-five thousand, six hundred fifty-two".