138037555564481 has 4 divisors (see below), whose sum is σ = 138037802515200. Its totient is φ = 138037308613764.

The previous prime is 138037555564459. The next prime is 138037555564541. The reversal of 138037555564481 is 184465555730831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138037555564481 - 2⁶ = 138037555564417 is a prime.

It is a super-2 number, since 2×138037555564481² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138037555564981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122635001 + ... + 123755478.

It is an arithmetic number, because the mean of its divisors is an integer number (34509450628800).

Almost surely, 2^{138037555564481} is an apocalyptic number.

It is an amenable number.

138037555564481 is a deficient number, since it is larger than the sum of its proper divisors (246950719).

138037555564481 is an equidigital number, since it uses as much as digits as its factorization.

138037555564481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246950718.

The product of its (nonzero) digits is 241920000, while the sum is 65.

The spelling of 138037555564481 in words is "one hundred thirty-eight trillion, thirty-seven billion, five hundred fifty-five million, five hundred sixty-four thousand, four hundred eighty-one".