8515487665 has 8 divisors (see below), whose sum is σ = 10219895208. Its totient is φ = 6811516800.

The previous prime is 8515487653. The next prime is 8515487689. The reversal of 8515487665 is 5667845158.

It can be written as a sum of positive squares in 4 ways, for example, as 5449982976 + 3065504689 = 73824^2 + 55367^2 .

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

It is not a de Polignac number, because 8515487665 - 2⁷ = 8515487537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 64612 + ... + 145621.

It is an arithmetic number, because the mean of its divisors is an integer number (1277486901).

Almost surely, 2^8515487665 is an apocalyptic number.

It is an amenable number.

8515487665 is a deficient number, since it is larger than the sum of its proper divisors (1704407543).

8515487665 is a wasteful number, since it uses less digits than its factorization.

8515487665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218339.

The product of its digits is 8064000, while the sum is 55.

The square root of 8515487665 is about 92279.4000034677. The cubic root of 8515487665 is about 2042.0663147091.

The spelling of 8515487665 in words is "eight billion, five hundred fifteen million, four hundred eighty-seven thousand, six hundred sixty-five".