8536644863 has 4 divisors (see below), whose sum is σ = 8697713688. Its totient is φ = 8375576040.

The previous prime is 8536644859. The next prime is 8536644899. The reversal of 8536644863 is 3684466358.

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

It is a cyclic number.

It is not a de Polignac number, because 8536644863 - 2² = 8536644859 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 161068771 = 8536644863 / (8 + 5 + 3 + 6 + 6 + 4 + 4 + 8 + 6 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8536640863) 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, 80534333 + ... + 80534438.

It is an arithmetic number, because the mean of its divisors is an integer number (2174428422).

Almost surely, 2^8536644863 is an apocalyptic number.

8536644863 is a deficient number, since it is larger than the sum of its proper divisors (161068825).

8536644863 is a wasteful number, since it uses less digits than its factorization.

8536644863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161068824.

The product of its digits is 9953280, while the sum is 53.

The square root of 8536644863 is about 92393.9655118233. The cubic root of 8536644863 is about 2043.7561247398.

The spelling of 8536644863 in words is "eight billion, five hundred thirty-six million, six hundred forty-four thousand, eight hundred sixty-three".