666631305115 has 4 divisors (see below), whose sum is σ = 799957566144. Its totient is φ = 533305044088.

The previous prime is 666631305089. The next prime is 666631305121. The reversal of 666631305115 is 511503136666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 511503136666 = 2 ⋅255751568333.

It is a cyclic number.

It is not a de Polignac number, because 666631305115 - 2¹⁵ = 666631272347 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66663130507 + ... + 66663130516.

It is an arithmetic number, because the mean of its divisors is an integer number (199989391536).

Almost surely, 2^666631305115 is an apocalyptic number.

666631305115 is a deficient number, since it is larger than the sum of its proper divisors (133326261029).

666631305115 is a wasteful number, since it uses less digits than its factorization.

666631305115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133326261028.

The product of its (nonzero) digits is 291600, while the sum is 43.

The spelling of 666631305115 in words is "six hundred sixty-six billion, six hundred thirty-one million, three hundred five thousand, one hundred fifteen".