665511015 has 48 divisors (see below), whose sum is σ = 1167288192. Its totient is φ = 323586432.

The previous prime is 665511013. The next prime is 665511017. The reversal of 665511015 is 510115566.

It is an interprime number because it is at equal distance from previous prime (665511013) and next prime (665511017).

It is not a de Polignac number, because 665511015 - 2¹ = 665511013 is a prime.

It is a super-2 number, since 2×665511015² = 885809822172660450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665511013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 208824 + ... + 211986.

It is an arithmetic number, because the mean of its divisors is an integer number (24318504).

Almost surely, 2^665511015 is an apocalyptic number.

665511015 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

665511015 is a deficient number, since it is larger than the sum of its proper divisors (501777177).

665511015 is a wasteful number, since it uses less digits than its factorization.

665511015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3280 (or 3267 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 30.

The square root of 665511015 is about 25797.5001695901. The cubic root of 665511015 is about 873.0753954217.

The spelling of 665511015 in words is "six hundred sixty-five million, five hundred eleven thousand, fifteen".