8138404778508 has 30 divisors (see below), whose sum is σ = 21275397677996. Its totient is φ = 2712801592728.

The previous prime is 8138404778461. The next prime is 8138404778531. The reversal of 8138404778508 is 8058774048318.

8138404778508 is a `hidden beast` number, since 8 + 1 + 3 + 84 + 0 + 47 + 7 + 8 + 508 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 12559266310 + ... + 12559266957.

Almost surely, 2^{8138404778508} is an apocalyptic number.

It is an amenable number.

8138404778508 is an abundant number, since it is smaller than the sum of its proper divisors (13136992899488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8138404778508 is a wasteful number, since it uses less digits than its factorization.

8138404778508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25118533283 (or 25118533272 counting only the distinct ones).

The product of its (nonzero) digits is 48168960, while the sum is 63.

The spelling of 8138404778508 in words is "eight trillion, one hundred thirty-eight billion, four hundred four million, seven hundred seventy-eight thousand, five hundred eight".