138768208475544 has 32 divisors (see below), whose sum is σ = 385467245766000. Its totient is φ = 46256069491776.

The previous prime is 138768208475527. The next prime is 138768208475621. The reversal of 138768208475544 is 445574802867831.

138768208475544 is a `hidden beast` number, since 1 + 3 + 8 + 7 + 6 + 8 + 2 + 0 + 8 + 4 + 75 + 544 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 321222704589 + ... + 321222705020.

Almost surely, 2^{138768208475544} is an apocalyptic number.

It is an amenable number.

138768208475544 is an abundant number, since it is smaller than the sum of its proper divisors (246699037290456).

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

138768208475544 is a wasteful number, since it uses less digits than its factorization.

138768208475544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642445409624 (or 642445409614 counting only the distinct ones).

The product of its (nonzero) digits is 1445068800, while the sum is 72.

The spelling of 138768208475544 in words is "one hundred thirty-eight trillion, seven hundred sixty-eight billion, two hundred eight million, four hundred seventy-five thousand, five hundred forty-four".