138147989544558 has 40 divisors (see below), whose sum is σ = 353775803915952. Its totient is φ = 39470854155264.

The previous prime is 138147989544557. The next prime is 138147989544611. The reversal of 138147989544558 is 855445989741831.

138147989544558 is a `hidden beast` number, since 1 + 3 + 8 + 1 + 4 + 7 + 9 + 8 + 9 + 54 + 4 + 558 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138147989544557) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 60911810835 + ... + 60911813102.

Almost surely, 2^{138147989544558} is an apocalyptic number.

138147989544558 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

138147989544558 is an abundant number, since it is smaller than the sum of its proper divisors (215627814371394).

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

138147989544558 is a wasteful number, since it uses less digits than its factorization.

138147989544558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121823623958 (or 121823623949 counting only the distinct ones).

The product of its digits is 6967296000, while the sum is 81.

The spelling of 138147989544558 in words is "one hundred thirty-eight trillion, one hundred forty-seven billion, nine hundred eighty-nine million, five hundred forty-four thousand, five hundred fifty-eight".