8618616581 has 8 divisors (see below), whose sum is σ = 9132312000. Its totient is φ = 8110929600.

The previous prime is 8618616563. The next prime is 8618616613. The reversal of 8618616581 is 1856168168.

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

It is a cyclic number.

It is not a de Polignac number, because 8618616581 - 2¹⁰ = 8618615557 is a prime.

It is a super-2 number, since 2×8618616581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8618616521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1499156 + ... + 1504893.

It is an arithmetic number, because the mean of its divisors is an integer number (1141539000).

Almost surely, 2^8618616581 is an apocalyptic number.

It is an amenable number.

8618616581 is a deficient number, since it is larger than the sum of its proper divisors (513695419).

8618616581 is a wasteful number, since it uses less digits than its factorization.

8618616581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3004219.

The product of its digits is 552960, while the sum is 50.

The square root of 8618616581 is about 92836.5045712084. The cubic root of 8618616581 is about 2050.2769073497.

The spelling of 8618616581 in words is "eight billion, six hundred eighteen million, six hundred sixteen thousand, five hundred eighty-one".