138436220077 has 4 divisors (see below), whose sum is σ = 141381671616. Its totient is φ = 135490768540.

The previous prime is 138436220051. The next prime is 138436220099. The reversal of 138436220077 is 770022634831.

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 138436220077 - 2⁷ = 138436219949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138436220677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1472725699 + ... + 1472725792.

It is an arithmetic number, because the mean of its divisors is an integer number (35345417904).

Almost surely, 2^138436220077 is an apocalyptic number.

It is an amenable number.

138436220077 is a deficient number, since it is larger than the sum of its proper divisors (2945451539).

138436220077 is an equidigital number, since it uses as much as digits as its factorization.

138436220077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2945451538.

The product of its (nonzero) digits is 338688, while the sum is 43.

The spelling of 138436220077 in words is "one hundred thirty-eight billion, four hundred thirty-six million, two hundred twenty thousand, seventy-seven".