8643856556 has 6 divisors (see below), whose sum is σ = 15126748980. Its totient is φ = 4321928276.

The previous prime is 8643856553. The next prime is 8643856577. The reversal of 8643856556 is 6556583468.

It is a super-2 number, since 2×8643856556² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8643856553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080482066 + ... + 1080482073.

It is an arithmetic number, because the mean of its divisors is an integer number (2521124830).

Almost surely, 2^8643856556 is an apocalyptic number.

It is an amenable number.

8643856556 is a deficient number, since it is larger than the sum of its proper divisors (6482892424).

8643856556 is a wasteful number, since it uses less digits than its factorization.

8643856556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2160964143 (or 2160964141 counting only the distinct ones).

The product of its digits is 20736000, while the sum is 56.

The square root of 8643856556 is about 92972.3429628403. The cubic root of 8643856556 is about 2052.2763969865.

The spelling of 8643856556 in words is "eight billion, six hundred forty-three million, eight hundred fifty-six thousand, five hundred fifty-six".