11508378138 has 48 divisors (see below), whose sum is σ = 25230401352. Its totient is φ = 3790800000.

The previous prime is 11508378137. The next prime is 11508378149. The reversal of 11508378138 is 83187380511.

11508378138 is a `hidden beast` number, since 1 + 1 + 508 + 3 + 7 + 8 + 138 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 11508354729 + 23409 = 107277^2 + 153^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11508378093 and 11508378102.

It is not an unprimeable number, because it can be changed into a prime (11508378137) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 977688 + ... + 989388.

Almost surely, 2^11508378138 is an apocalyptic number.

11508378138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11508378138 is an abundant number, since it is smaller than the sum of its proper divisors (13722023214).

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

11508378138 is a wasteful number, since it uses less digits than its factorization.

11508378138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12351 (or 12348 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 11508378138 in words is "eleven billion, five hundred eight million, three hundred seventy-eight thousand, one hundred thirty-eight".