138491076642 has 8 divisors (see below), whose sum is σ = 276982153296. Its totient is φ = 46163692212.

The previous prime is 138491076631. The next prime is 138491076649. The reversal of 138491076642 is 246670194831.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

138491076642 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (138491076649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11540923048 + ... + 11540923059.

It is an arithmetic number, because the mean of its divisors is an integer number (34622769162).

Almost surely, 2^138491076642 is an apocalyptic number.

138491076642 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

138491076642 is a wasteful number, since it uses less digits than its factorization.

138491076642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23081846112.

The product of its (nonzero) digits is 1741824, while the sum is 51.

The spelling of 138491076642 in words is "one hundred thirty-eight billion, four hundred ninety-one million, seventy-six thousand, six hundred forty-two".