263838984138 has 24 divisors (see below), whose sum is σ = 572281433568. Its totient is φ = 87849358632.

The previous prime is 263838984091. The next prime is 263838984139. The reversal of 263838984138 is 831489838362.

263838984138 is a `hidden beast` number, since 2 + 63 + 83 + 89 + 8 + 413 + 8 = 666.

It is a super-2 number, since 2×263838984138² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (263838984139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8064006 + ... + 8096657.

It is an arithmetic number, because the mean of its divisors is an integer number (23845059732).

Almost surely, 2^263838984138 is an apocalyptic number.

263838984138 is an abundant number, since it is smaller than the sum of its proper divisors (308442449430).

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

263838984138 is a wasteful number, since it uses less digits than its factorization.

263838984138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16161578 (or 16161575 counting only the distinct ones).

The product of its digits is 47775744, while the sum is 63.

The spelling of 263838984138 in words is "two hundred sixty-three billion, eight hundred thirty-eight million, nine hundred eighty-four thousand, one hundred thirty-eight".