138861408005 has 16 divisors (see below), whose sum is σ = 167092685760. Its totient is φ = 110783299968.

The previous prime is 138861407957. The next prime is 138861408013. The reversal of 138861408005 is 500804168831.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 138861408005 - 2⁶ = 138861407941 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8177654 + ... + 8194616.

It is an arithmetic number, because the mean of its divisors is an integer number (10443292860).

Almost surely, 2^138861408005 is an apocalyptic number.

It is an amenable number.

138861408005 is a deficient number, since it is larger than the sum of its proper divisors (28231277755).

138861408005 is a wasteful number, since it uses less digits than its factorization.

138861408005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21380.

The product of its (nonzero) digits is 184320, while the sum is 44.

The spelling of 138861408005 in words is "one hundred thirty-eight billion, eight hundred sixty-one million, four hundred eight thousand, five".