8138358568 has 8 divisors (see below), whose sum is σ = 15259422330. Its totient is φ = 4069179280.

The previous prime is 8138358551. The next prime is 8138358577. The reversal of 8138358568 is 8658538318.

It can be written as a sum of positive squares in only one way, i.e., 6516041284 + 1622317284 = 80722^2 + 40278^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 508647403 + ... + 508647418.

Almost surely, 2^8138358568 is an apocalyptic number.

It is an amenable number.

8138358568 is a deficient number, since it is larger than the sum of its proper divisors (7121063762).

8138358568 is a wasteful number, since it uses less digits than its factorization.

8138358568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017294827 (or 1017294823 counting only the distinct ones).

The product of its digits is 5529600, while the sum is 55.

The square root of 8138358568 is about 90212.8514569848. The cubic root of 8138358568 is about 2011.4640429716.

It can be divided in two parts, 813835 and 8568, that added together give a triangular number (822403 = T₁₂₈₂).

The spelling of 8138358568 in words is "eight billion, one hundred thirty-eight million, three hundred fifty-eight thousand, five hundred sixty-eight".