666275684501 has 8 divisors (see below), whose sum is σ = 776997883200. Its totient is φ = 571093443564.

The previous prime is 666275684497. The next prime is 666275684507. The reversal of 666275684501 is 105486572666.

It is not a de Polignac number, because 666275684501 - 2² = 666275684497 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666275684507) by changing a digit.

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, 971247011 + ... + 971247696.

It is an arithmetic number, because the mean of its divisors is an integer number (97124735400).

Almost surely, 2^666275684501 is an apocalyptic number.

It is an amenable number.

666275684501 is a deficient number, since it is larger than the sum of its proper divisors (110722198699).

666275684501 is an equidigital number, since it uses as much as digits as its factorization.

666275684501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1942494728 (or 1942494714 counting only the distinct ones).

The product of its (nonzero) digits is 14515200, while the sum is 56.

The spelling of 666275684501 in words is "six hundred sixty-six billion, two hundred seventy-five million, six hundred eighty-four thousand, five hundred one".