66630641 has 12 divisors (see below), whose sum is σ = 84556080. Its totient is φ = 51919560.

The previous prime is 66630611. The next prime is 66630649. The reversal of 66630641 is 14603666.

It is a de Polignac number, because none of the positive numbers 2^k-66630641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66630598 and 66630607.

It is not an unprimeable number, because it can be changed into a prime (66630649) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 61271 + ... + 62348.

It is an arithmetic number, because the mean of its divisors is an integer number (7046340).

Almost surely, 2^66630641 is an apocalyptic number.

It is an amenable number.

66630641 is a deficient number, since it is larger than the sum of its proper divisors (17925439).

66630641 is a wasteful number, since it uses less digits than its factorization.

66630641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123644 (or 123637 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 66630641 is about 8162.7593986348. The cubic root of 66630641 is about 405.4070814174.

The spelling of 66630641 in words is "sixty-six million, six hundred thirty thousand, six hundred forty-one".