1158532111638 has 72 divisors (see below), whose sum is σ = 2790991770840. Its totient is φ = 344446202880.

The previous prime is 1158532111613. The next prime is 1158532111657. The reversal of 1158532111638 is 8361112358511.

1158532111638 is a `hidden beast` number, since 1 + 1 + 5 + 8 + 5 + 3 + 2 + 1 + 1 + 1 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1158532111593 and 1158532111602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 485323 + ... + 1597686.

It is an arithmetic number, because the mean of its divisors is an integer number (38763774595).

Almost surely, 2^{1158532111638} is an apocalyptic number.

1158532111638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1158532111638 is an abundant number, since it is smaller than the sum of its proper divisors (1632459659202).

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

1158532111638 is a wasteful number, since it uses less digits than its factorization.

1158532111638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2083134 (or 2083078 counting only the distinct ones).

The product of its digits is 172800, while the sum is 45.

The spelling of 1158532111638 in words is "one trillion, one hundred fifty-eight billion, five hundred thirty-two million, one hundred eleven thousand, six hundred thirty-eight".