138844428025802 has 4 divisors (see below), whose sum is σ = 208266642038706. Its totient is φ = 69422214012900.

The previous prime is 138844428025759. The next prime is 138844428025861. The reversal of 138844428025802 is 208520824448831.

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., 104988077684161 + 33856350341641 = 10246369^2 + 5818621^2 .

It is a super-2 number, since 2×138844428025802² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34711107006449 + ... + 34711107006452.

Almost surely, 2^{138844428025802} is an apocalyptic number.

138844428025802 is a deficient number, since it is larger than the sum of its proper divisors (69422214012904).

138844428025802 is an equidigital number, since it uses as much as digits as its factorization.

138844428025802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69422214012903.

The product of its (nonzero) digits is 31457280, while the sum is 59.

The spelling of 138844428025802 in words is "one hundred thirty-eight trillion, eight hundred forty-four billion, four hundred twenty-eight million, twenty-five thousand, eight hundred two".