665515011 has 32 divisors (see below), whose sum is σ = 1054425600. Its totient is φ = 373088352.

The previous prime is 665515009. The next prime is 665515013. The reversal of 665515011 is 110515566.

665515011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (665515009) and next prime (665515013).

It is not a de Polignac number, because 665515011 - 2¹ = 665515009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 665515011.

It is not an unprimeable number, because it can be changed into a prime (665515013) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48436 + ... + 60638.

It is an arithmetic number, because the mean of its divisors is an integer number (32950800).

Almost surely, 2^665515011 is an apocalyptic number.

665515011 is a deficient number, since it is larger than the sum of its proper divisors (388910589).

665515011 is a wasteful number, since it uses less digits than its factorization.

665515011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12280 (or 12266 counting only the distinct ones).

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

The square root of 665515011 is about 25797.5776188386. The cubic root of 665515011 is about 873.0771428519.

The spelling of 665515011 in words is "six hundred sixty-five million, five hundred fifteen thousand, eleven".