666656052 has 24 divisors (see below), whose sum is σ = 1556646336. Its totient is φ = 222059328.

The previous prime is 666656051. The next prime is 666656057. The reversal of 666656052 is 250656666.

It is a junction number, because it is equal to n+sod(n) for n = 666655995 and 666656013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666656051) 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 7 ways as a sum of consecutive naturals, for example, 1833 + ... + 36560.

It is an arithmetic number, because the mean of its divisors is an integer number (64860264).

Almost surely, 2^666656052 is an apocalyptic number.

It is an amenable number.

666656052 is an abundant number, since it is smaller than the sum of its proper divisors (889990284).

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

666656052 is a wasteful number, since it uses less digits than its factorization.

666656052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39847 (or 39845 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 42.

The square root of 666656052 is about 25819.6834217618. The cubic root of 666656052 is about 873.5758283290.

The spelling of 666656052 in words is "six hundred sixty-six million, six hundred fifty-six thousand, fifty-two".