138005266250 has 20 divisors (see below), whose sum is σ = 258677073402. Its totient is φ = 55202106000.

The previous prime is 138005266151. The next prime is 138005266253. The reversal of 138005266250 is 52662500831.

It can be written as a sum of positive squares in 5 ways, for example, as 28624917721 + 109380348529 = 169189^2 + 330727^2 .

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (138005266253) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 55200857 + ... + 55203356.

Almost surely, 2^138005266250 is an apocalyptic number.

138005266250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138005266250 is a deficient number, since it is larger than the sum of its proper divisors (120671807152).

138005266250 is an equidigital number, since it uses as much as digits as its factorization.

138005266250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110404235 (or 110404220 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 138005266250 in words is "one hundred thirty-eight billion, five million, two hundred sixty-six thousand, two hundred fifty".