138671251550 has 144 divisors (see below), whose sum is σ = 294750018720. Its totient is φ = 48419205120.

The previous prime is 138671251547. The next prime is 138671251571. The reversal of 138671251550 is 55152176831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 17293142 + ... + 17301158.

It is an arithmetic number, because the mean of its divisors is an integer number (2046875130).

Almost surely, 2^138671251550 is an apocalyptic number.

138671251550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138671251550 is an abundant number, since it is smaller than the sum of its proper divisors (156078767170).

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

138671251550 is a wasteful number, since it uses less digits than its factorization.

138671251550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8167 (or 8149 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 44.

The spelling of 138671251550 in words is "one hundred thirty-eight billion, six hundred seventy-one million, two hundred fifty-one thousand, five hundred fifty".