666510005 has 24 divisors (see below), whose sum is σ = 932954112. Its totient is φ = 455777952.

The previous prime is 666510001. The next prime is 666510011. The reversal of 666510005 is 500015666.

It is not a de Polignac number, because 666510005 - 2² = 666510001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 666510005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666510001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90284 + ... + 97386.

It is an arithmetic number, because the mean of its divisors is an integer number (38873088).

Almost surely, 2^666510005 is an apocalyptic number.

It is an amenable number.

666510005 is a deficient number, since it is larger than the sum of its proper divisors (266444107).

666510005 is a wasteful number, since it uses less digits than its factorization.

666510005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7505 (or 7498 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 666510005 is about 25816.8550563387. The cubic root of 666510005 is about 873.5120310898.

The spelling of 666510005 in words is "six hundred sixty-six million, five hundred ten thousand, five".