515660665005 has 48 divisors (see below), whose sum is σ = 899683452720. Its totient is φ = 273218187264.

The previous prime is 515660664991. The next prime is 515660665007. The reversal of 515660665005 is 500566066515.

It can be written as a sum of positive squares in 8 ways, for example, as 3110627529 + 512550037476 = 55773^2 + 715926^2 .

It is not a de Polignac number, because 515660665005 - 2¹² = 515660660909 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515660665007) 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 47 ways as a sum of consecutive naturals, for example, 4212727 + ... + 4333403.

It is an arithmetic number, because the mean of its divisors is an integer number (18743405265).

Almost surely, 2^515660665005 is an apocalyptic number.

It is an amenable number.

515660665005 is a deficient number, since it is larger than the sum of its proper divisors (384022787715).

515660665005 is a wasteful number, since it uses less digits than its factorization.

515660665005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121310 (or 121307 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The spelling of 515660665005 in words is "five hundred fifteen billion, six hundred sixty million, six hundred sixty-five thousand, five".