66627657 has 8 divisors (see below), whose sum is σ = 98707680. Its totient is φ = 44418420.

The previous prime is 66627647. The next prime is 66627679. The reversal of 66627657 is 75672666.

66627657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66627657 - 2⁶ = 66627593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66627647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1233819 + ... + 1233872.

It is an arithmetic number, because the mean of its divisors is an integer number (12338460).

Almost surely, 2^66627657 is an apocalyptic number.

It is an amenable number.

66627657 is a deficient number, since it is larger than the sum of its proper divisors (32080023).

66627657 is a wasteful number, since it uses less digits than its factorization.

66627657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2467700 (or 2467694 counting only the distinct ones).

The product of its digits is 635040, while the sum is 45.

The square root of 66627657 is about 8162.5766152606. The cubic root of 66627657 is about 405.4010293830.

The spelling of 66627657 in words is "sixty-six million, six hundred twenty-seven thousand, six hundred fifty-seven".