138905185601 has 8 divisors (see below), whose sum is σ = 170960228544. Its totient is φ = 109903003920.

The previous prime is 138905185597. The next prime is 138905185603. The reversal of 138905185601 is 106581509831.

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

It is a cyclic number.

It is not a de Polignac number, because 138905185601 - 2² = 138905185597 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138905185603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 763215215 + ... + 763215396.

It is an arithmetic number, because the mean of its divisors is an integer number (21370028568).

Almost surely, 2^138905185601 is an apocalyptic number.

It is an amenable number.

138905185601 is a deficient number, since it is larger than the sum of its proper divisors (32055042943).

138905185601 is a wasteful number, since it uses less digits than its factorization.

138905185601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526430631.

The product of its (nonzero) digits is 259200, while the sum is 47.

The spelling of 138905185601 in words is "one hundred thirty-eight billion, nine hundred five million, one hundred eighty-five thousand, six hundred one".