66646252 has 6 divisors (see below), whose sum is σ = 116630948. Its totient is φ = 33323124.

The previous prime is 66646247. The next prime is 66646291. The reversal of 66646252 is 25264666.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8330778 + ... + 8330785.

Almost surely, 2^66646252 is an apocalyptic number.

It is an amenable number.

66646252 is a deficient number, since it is larger than the sum of its proper divisors (49984696).

66646252 is a wasteful number, since it uses less digits than its factorization.

66646252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16661567 (or 16661565 counting only the distinct ones).

The product of its digits is 103680, while the sum is 37.

The square root of 66646252 is about 8163.7155756432. The cubic root of 66646252 is about 405.4387401040.

The spelling of 66646252 in words is "sixty-six million, six hundred forty-six thousand, two hundred fifty-two".