666587000785665 has 16 divisors (see below), whose sum is σ = 1066665523762368. Its totient is φ = 355470959583936.

The previous prime is 666587000785609. The next prime is 666587000785691. The reversal of 666587000785665 is 566587000785666.

It is not a de Polignac number, because 666587000785665 - 2¹⁰ = 666587000784641 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2631587994 + ... + 2631841283.

It is an arithmetic number, because the mean of its divisors is an integer number (66666595235148).

Almost surely, 2^{666587000785665} is an apocalyptic number.

It is an amenable number.

666587000785665 is a deficient number, since it is larger than the sum of its proper divisors (400078522976703).

666587000785665 is a wasteful number, since it uses less digits than its factorization.

666587000785665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5263437728.

The product of its (nonzero) digits is 3048192000, while the sum is 75.

Subtracting from 666587000785665 its reverse (566587000785666), we obtain a palindrome (99999999999999).

The spelling of 666587000785665 in words is "six hundred sixty-six trillion, five hundred eighty-seven billion, seven hundred eighty-five thousand, six hundred sixty-five".