138529701826 has 4 divisors (see below), whose sum is σ = 207794552742. Its totient is φ = 69264850912.

The previous prime is 138529701823. The next prime is 138529701853. The reversal of 138529701826 is 628107925831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 81456014025 + 57073687801 = 285405^2 + 238901^2 .

It is a super-3 number, since 3×138529701826³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (138529701823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34632425455 + ... + 34632425458.

Almost surely, 2^138529701826 is an apocalyptic number.

138529701826 is a deficient number, since it is larger than the sum of its proper divisors (69264850916).

138529701826 is an equidigital number, since it uses as much as digits as its factorization.

138529701826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69264850915.

The product of its (nonzero) digits is 1451520, while the sum is 52.

The spelling of 138529701826 in words is "one hundred thirty-eight billion, five hundred twenty-nine million, seven hundred one thousand, eight hundred twenty-six".