66660000623 has 4 divisors (see below), whose sum is σ = 66754021080. Its totient is φ = 66565980168.

The previous prime is 66660000613. The next prime is 66660000697. The reversal of 66660000623 is 32600006666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66660000623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66660000613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47009165 + ... + 47010582.

It is an arithmetic number, because the mean of its divisors is an integer number (16688505270).

Almost surely, 2^66660000623 is an apocalyptic number.

66660000623 is a deficient number, since it is larger than the sum of its proper divisors (94020457).

66660000623 is an equidigital number, since it uses as much as digits as its factorization.

66660000623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94020456.

The product of its (nonzero) digits is 46656, while the sum is 35.

The spelling of 66660000623 in words is "sixty-six billion, six hundred sixty million, six hundred twenty-three", and thus it is an aban number.