665666111155 has 8 divisors (see below), whose sum is σ = 799020445392. Its totient is φ = 532385480928.

The previous prime is 665666111147. The next prime is 665666111161. The reversal of 665666111155 is 551111666566.

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

It is a cyclic number.

It is not a de Polignac number, because 665666111155 - 2³ = 665666111147 is a prime.

It is a super-2 number, since 2×665666111155² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665666111099 and 665666111108.

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 7 ways as a sum of consecutive naturals, for example, 18406129 + ... + 18442258.

It is an arithmetic number, because the mean of its divisors is an integer number (99877555674).

Almost surely, 2^665666111155 is an apocalyptic number.

665666111155 is a deficient number, since it is larger than the sum of its proper divisors (133354334237).

665666111155 is a wasteful number, since it uses less digits than its factorization.

665666111155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36852005.

The product of its digits is 972000, while the sum is 49.

The spelling of 665666111155 in words is "six hundred sixty-five billion, six hundred sixty-six million, one hundred eleven thousand, one hundred fifty-five".