138236440677 has 16 divisors (see below), whose sum is σ = 186859069440. Its totient is φ = 90888353712.

The previous prime is 138236440633. The next prime is 138236440681. The reversal of 138236440677 is 776044632831.

It is not a de Polignac number, because 138236440677 - 2⁸ = 138236440421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138236442677) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118573 + ... + 539010.

It is an arithmetic number, because the mean of its divisors is an integer number (11678691840).

Almost surely, 2^138236440677 is an apocalyptic number.

It is an amenable number.

138236440677 is a deficient number, since it is larger than the sum of its proper divisors (48622628763).

138236440677 is an equidigital number, since it uses as much as digits as its factorization.

138236440677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658552.

The product of its (nonzero) digits is 4064256, while the sum is 51.

The spelling of 138236440677 in words is "one hundred thirty-eight billion, two hundred thirty-six million, four hundred forty thousand, six hundred seventy-seven".