138138250008 has 32 divisors (see below), whose sum is σ = 376740682560. Its totient is φ = 41860075680.

The previous prime is 138138250007. The next prime is 138138250067. The reversal of 138138250008 is 800052831831.

It is a super-2 number, since 2×138138250008² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138138250007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261625210 + ... + 261625737.

It is an arithmetic number, because the mean of its divisors is an integer number (11773146330).

Almost surely, 2^138138250008 is an apocalyptic number.

It is an amenable number.

138138250008 is an abundant number, since it is smaller than the sum of its proper divisors (238602432552).

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

138138250008 is a wasteful number, since it uses less digits than its factorization.

138138250008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523250967 (or 523250963 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The spelling of 138138250008 in words is "one hundred thirty-eight billion, one hundred thirty-eight million, two hundred fifty thousand, eight".