1138915775538 has 24 divisors (see below), whose sum is σ = 2467673208000. Its totient is φ = 379635151704.

The previous prime is 1138915775537. The next prime is 1138915775549. The reversal of 1138915775538 is 8355775198311.

1138915775538 is a `hidden beast` number, since 1 + 1 + 3 + 8 + 9 + 1 + 5 + 77 + 553 + 8 = 666.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1138915775537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2472763 + ... + 2896961.

It is an arithmetic number, because the mean of its divisors is an integer number (102819717000).

Almost surely, 2^{1138915775538} is an apocalyptic number.

1138915775538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1138915775538 is an abundant number, since it is smaller than the sum of its proper divisors (1328757432462).

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

1138915775538 is a wasteful number, since it uses less digits than its factorization.

1138915775538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573366 (or 573363 counting only the distinct ones).

The product of its digits is 31752000, while the sum is 63.

The spelling of 1138915775538 in words is "one trillion, one hundred thirty-eight billion, nine hundred fifteen million, seven hundred seventy-five thousand, five hundred thirty-eight".