138739566474 has 128 divisors (see below), whose sum is σ = 331816608000. Its totient is φ = 43376083200.

The previous prime is 138739566419. The next prime is 138739566491. The reversal of 138739566474 is 474665937831.

It is a happy number.

138739566474 is a `hidden beast` number, since 1 + 3 + 8 + 73 + 95 + 6 + 6 + 474 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8385442 + ... + 8401970.

It is an arithmetic number, because the mean of its divisors is an integer number (2592317250).

Almost surely, 2^138739566474 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138739566474, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165908304000).

138739566474 is an abundant number, since it is smaller than the sum of its proper divisors (193077041526).

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

138739566474 is a wasteful number, since it uses less digits than its factorization.

138739566474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16672 (or 16654 counting only the distinct ones).

The product of its digits is 91445760, while the sum is 63.

The spelling of 138739566474 in words is "one hundred thirty-eight billion, seven hundred thirty-nine million, five hundred sixty-six thousand, four hundred seventy-four".