8664857557 has 4 divisors (see below), whose sum is σ = 8683818316. Its totient is φ = 8645896800.

The previous prime is 8664857507. The next prime is 8664857599. The reversal of 8664857557 is 7557584668.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7549698321 + 1115159236 = 86889^2 + 33394^2 .

It is a cyclic number.

It is not a de Polignac number, because 8664857557 - 2¹⁵ = 8664824789 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8664857495 and 8664857504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8664857507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9479694 + ... + 9480607.

It is an arithmetic number, because the mean of its divisors is an integer number (2170954579).

Almost surely, 2^8664857557 is an apocalyptic number.

It is an amenable number.

8664857557 is a deficient number, since it is larger than the sum of its proper divisors (18960759).

8664857557 is a wasteful number, since it uses less digits than its factorization.

8664857557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18960758.

The product of its digits is 56448000, while the sum is 61.

The square root of 8664857557 is about 93085.2166404526. The cubic root of 8664857557 is about 2053.9371140700.

The spelling of 8664857557 in words is "eight billion, six hundred sixty-four million, eight hundred fifty-seven thousand, five hundred fifty-seven".