8663616261 has 12 divisors (see below), whose sum is σ = 12559293292. Its totient is φ = 5754891456.

The previous prime is 8663616253. The next prime is 8663616293. The reversal of 8663616261 is 1626163668.

8663616261 is a `hidden beast` number, since 8 + 6 + 6 + 3 + 616 + 26 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 830304225 + 7833312036 = 28815^2 + 88506^2 .

It is not a de Polignac number, because 8663616261 - 2³ = 8663616253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8663616251) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 1735096 + ... + 1740081.

Almost surely, 2^8663616261 is an apocalyptic number.

It is an amenable number.

8663616261 is a deficient number, since it is larger than the sum of its proper divisors (3895677031).

8663616261 is a wasteful number, since it uses less digits than its factorization.

8663616261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3475460 (or 3475457 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 8663616261 is about 93078.5488767417. The cubic root of 8663616261 is about 2053.8390295309.

The spelling of 8663616261 in words is "eight billion, six hundred sixty-three million, six hundred sixteen thousand, two hundred sixty-one".