144636726557 has 4 divisors (see below), whose sum is σ = 144637489500. Its totient is φ = 144635963616.

The previous prime is 144636726523. The next prime is 144636726589. The reversal of 144636726557 is 755627636441.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 103448429956 + 41188296601 = 321634^2 + 202949^2 .

It is a cyclic number.

It is not a de Polignac number, because 144636726557 - 2²⁰ = 144635677981 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 (144636723557) 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, 146153 + ... + 557345.

It is an arithmetic number, because the mean of its divisors is an integer number (36159372375).

Almost surely, 2^144636726557 is an apocalyptic number.

It is an amenable number.

144636726557 is a deficient number, since it is larger than the sum of its proper divisors (762943).

144636726557 is an equidigital number, since it uses as much as digits as its factorization.

144636726557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762942.

The product of its digits is 25401600, while the sum is 56.

The spelling of 144636726557 in words is "one hundred forty-four billion, six hundred thirty-six million, seven hundred twenty-six thousand, five hundred fifty-seven".