8661974815 has 16 divisors (see below), whose sum is σ = 11204178048. Its totient is φ = 6390683136.

The previous prime is 8661974803. The next prime is 8661974837. The reversal of 8661974815 is 5184791668.

8661974815 = T₁₆₂₉₃ + T₁₆₂₉₄ + ... + T₁₆₃₅₇.

8661974815 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 8661974815 - 2¹³ = 8661966623 is a prime.

It is a Duffinian number.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 11287 + ... + 132103.

It is an arithmetic number, because the mean of its divisors is an integer number (700261128).

Almost surely, 2^8661974815 is an apocalyptic number.

8661974815 is a deficient number, since it is larger than the sum of its proper divisors (2542203233).

8661974815 is a wasteful number, since it uses less digits than its factorization.

8661974815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121938.

The product of its digits is 2903040, while the sum is 55.

The square root of 8661974815 is about 93069.7309279446. The cubic root of 8661974815 is about 2053.7093116128.

The spelling of 8661974815 in words is "eight billion, six hundred sixty-one million, nine hundred seventy-four thousand, eight hundred fifteen".