138664550158 has 4 divisors (see below), whose sum is σ = 207996825240. Its totient is φ = 69332275078.

The previous prime is 138664550153. The next prime is 138664550179. The reversal of 138664550158 is 851055466831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138664550153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34666137538 + ... + 34666137541.

It is an arithmetic number, because the mean of its divisors is an integer number (51999206310).

Almost surely, 2^138664550158 is an apocalyptic number.

138664550158 is a deficient number, since it is larger than the sum of its proper divisors (69332275082).

138664550158 is an equidigital number, since it uses as much as digits as its factorization.

138664550158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69332275081.

The product of its (nonzero) digits is 3456000, while the sum is 52.

The spelling of 138664550158 in words is "one hundred thirty-eight billion, six hundred sixty-four million, five hundred fifty thousand, one hundred fifty-eight".