66622660 has 48 divisors (see below), whose sum is σ = 159543216. Its totient is φ = 23150592.

The previous prime is 66622639. The next prime is 66622691. The reversal of 66622660 is 6622666.

It is a happy number.

66622660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 1077444 + 65545216 = 1038^2 + 8096^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3117 + ... + 11956.

It is an arithmetic number, because the mean of its divisors is an integer number (3323817).

Almost surely, 2^66622660 is an apocalyptic number.

It is an amenable number.

66622660 is an abundant number, since it is smaller than the sum of its proper divisors (92920556).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66622660 is a wasteful number, since it uses less digits than its factorization.

66622660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15112 (or 15110 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 66622660 is about 8162.2705174479. The cubic root of 66622660 is about 405.3908942546.

The spelling of 66622660 in words is "sixty-six million, six hundred twenty-two thousand, six hundred sixty".