138578307550 has 48 divisors (see below), whose sum is σ = 273534559632. Its totient is φ = 52052748800.

The previous prime is 138578307523. The next prime is 138578307557. The reversal of 138578307550 is 55703875831.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138578307557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 192540 + ... + 560560.

It is an arithmetic number, because the mean of its divisors is an integer number (5698636659).

Almost surely, 2^138578307550 is an apocalyptic number.

138578307550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138578307550 is a deficient number, since it is larger than the sum of its proper divisors (134956252082).

138578307550 is a wasteful number, since it uses less digits than its factorization.

138578307550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368493 (or 368488 counting only the distinct ones).

The product of its (nonzero) digits is 3528000, while the sum is 52.

The spelling of 138578307550 in words is "one hundred thirty-eight billion, five hundred seventy-eight million, three hundred seven thousand, five hundred fifty".