665505155 has 8 divisors (see below), whose sum is σ = 912692832. Its totient is φ = 456346368.

The previous prime is 665505151. The next prime is 665505221. The reversal of 665505155 is 551505566.

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 665505155 - 2² = 665505151 is a prime.

It is a super-2 number, since 2×665505155² = 885794222663148050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665505151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9507182 + ... + 9507251.

It is an arithmetic number, because the mean of its divisors is an integer number (114086604).

Almost surely, 2^665505155 is an apocalyptic number.

665505155 is a deficient number, since it is larger than the sum of its proper divisors (247187677).

665505155 is a wasteful number, since it uses less digits than its factorization.

665505155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19014445.

The product of its (nonzero) digits is 112500, while the sum is 38.

The square root of 665505155 is about 25797.3865924438. The cubic root of 665505155 is about 873.0728328611.

The spelling of 665505155 in words is "six hundred sixty-five million, five hundred five thousand, one hundred fifty-five".