8661557704 has 8 divisors (see below), whose sum is σ = 16240420710. Its totient is φ = 4330778848.

The previous prime is 8661557699. The next prime is 8661557747. The reversal of 8661557704 is 4077551668.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 4858368804 + 3803188900 = 69702^2 + 61670^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 541347349 + ... + 541347364.

Almost surely, 2^8661557704 is an apocalyptic number.

It is an amenable number.

8661557704 is a deficient number, since it is larger than the sum of its proper divisors (7578863006).

8661557704 is a wasteful number, since it uses less digits than its factorization.

8661557704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082694719 (or 1082694715 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 49.

The square root of 8661557704 is about 93067.4900488887. The cubic root of 8661557704 is about 2053.6763461320.

The spelling of 8661557704 in words is "eight billion, six hundred sixty-one million, five hundred fifty-seven thousand, seven hundred four".