138688641502 has 8 divisors (see below), whose sum is σ = 208806319800. Its totient is φ = 69086534904.

The previous prime is 138688641499. The next prime is 138688641569. The reversal of 138688641502 is 205146886831.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 138688641502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128892252 + ... + 128893327.

It is an arithmetic number, because the mean of its divisors is an integer number (26100789975).

Almost surely, 2^138688641502 is an apocalyptic number.

138688641502 is a deficient number, since it is larger than the sum of its proper divisors (70117678298).

138688641502 is a wasteful number, since it uses less digits than its factorization.

138688641502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257785850.

The product of its (nonzero) digits is 2211840, while the sum is 52.

The spelling of 138688641502 in words is "one hundred thirty-eight billion, six hundred eighty-eight million, six hundred forty-one thousand, five hundred two".