666550064 has 10 divisors (see below), whose sum is σ = 1291440780. Its totient is φ = 333275024.

The previous prime is 666550021. The next prime is 666550069. The reversal of 666550064 is 460055666.

It is not an unprimeable number, because it can be changed into a prime (666550069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20829674 + ... + 20829705.

It is an arithmetic number, because the mean of its divisors is an integer number (129144078).

Almost surely, 2^666550064 is an apocalyptic number.

It is an amenable number.

666550064 is a deficient number, since it is larger than the sum of its proper divisors (624890716).

666550064 is a wasteful number, since it uses less digits than its factorization.

666550064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41659387 (or 41659381 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 666550064 is about 25817.6308750435. The cubic root of 666550064 is about 873.5295308608.

The spelling of 666550064 in words is "six hundred sixty-six million, five hundred fifty thousand, sixty-four".