66655255665 has 16 divisors (see below), whose sum is σ = 106675041600. Its totient is φ = 35540592192.

The previous prime is 66655255651. The next prime is 66655255679. The reversal of 66655255665 is 56655255666.

It is an interprime number because it is at equal distance from previous prime (66655255651) and next prime (66655255679).

It is not a de Polignac number, because 66655255665 - 2²² = 66651061361 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, 492550 + ... + 613119.

It is an arithmetic number, because the mean of its divisors is an integer number (6667190100).

Almost surely, 2^66655255665 is an apocalyptic number.

It is an amenable number.

66655255665 is a deficient number, since it is larger than the sum of its proper divisors (40019785935).

66655255665 is a wasteful number, since it uses less digits than its factorization.

66655255665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109696.

The product of its digits is 48600000, while the sum is 57.

Subtracting from 66655255665 its reverse (56655255666), we obtain a palindrome (9999999999).

The spelling of 66655255665 in words is "sixty-six billion, six hundred fifty-five million, two hundred fifty-five thousand, six hundred sixty-five".