1138281508161 has 24 divisors (see below), whose sum is σ = 1880790335424. Its totient is φ = 649850343840.

The previous prime is 1138281508157. The next prime is 1138281508223. The reversal of 1138281508161 is 1618051828311.

1138281508161 is a `hidden beast` number, since 1 + 1 + 3 + 8 + 2 + 81 + 508 + 1 + 61 = 666.

It is not a de Polignac number, because 1138281508161 - 2² = 1138281508157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1138281508061) 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, 8211726 + ... + 8349191.

It is an arithmetic number, because the mean of its divisors is an integer number (78366263976).

Almost surely, 2^{1138281508161} is an apocalyptic number.

It is an amenable number.

1138281508161 is a deficient number, since it is larger than the sum of its proper divisors (742508827263).

1138281508161 is a wasteful number, since it uses less digits than its factorization.

1138281508161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16562021 (or 16562018 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 45.

The spelling of 1138281508161 in words is "one trillion, one hundred thirty-eight billion, two hundred eighty-one million, five hundred eight thousand, one hundred sixty-one".