6665166555 has 8 divisors (see below), whose sum is σ = 10664266512. Its totient is φ = 3554755488.

The previous prime is 6665166551. The next prime is 6665166577. The reversal of 6665166555 is 5556615666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6665166555 - 2² = 6665166551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6665166498 and 6665166507.

It is not an unprimeable number, because it can be changed into a prime (6665166551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222172204 + ... + 222172233.

It is an arithmetic number, because the mean of its divisors is an integer number (1333033314).

Almost surely, 2^6665166555 is an apocalyptic number.

6665166555 is a deficient number, since it is larger than the sum of its proper divisors (3999099957).

6665166555 is a wasteful number, since it uses less digits than its factorization.

6665166555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444344445.

The product of its digits is 4860000, while the sum is 51.

The square root of 6665166555 is about 81640.4713055970. The cubic root of 6665166555 is about 1881.9308812599.

The spelling of 6665166555 in words is "six billion, six hundred sixty-five million, one hundred sixty-six thousand, five hundred fifty-five".