66672660 has 24 divisors (see below), whose sum is σ = 186683616. Its totient is φ = 17779360.

The previous prime is 66672559. The next prime is 66672677. The reversal of 66672660 is 6627666.

66672660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 555546 + ... + 555665.

It is an arithmetic number, because the mean of its divisors is an integer number (7778484).

Almost surely, 2^66672660 is an apocalyptic number.

66672660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66672660 is an abundant number, since it is smaller than the sum of its proper divisors (120010956).

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

66672660 is a wasteful number, since it uses less digits than its factorization.

66672660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111223 (or 1111221 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 39.

The square root of 66672660 is about 8165.3328162421. The cubic root of 66672660 is about 405.4922835621.

The spelling of 66672660 in words is "sixty-six million, six hundred seventy-two thousand, six hundred sixty".