118581743449 has 9 divisors (see below), whose sum is σ = 128409930813. Its totient is φ = 109455938592.

The previous prime is 118581743443. The next prime is 118581743491. The reversal of 118581743449 is 944347185811.

The square root of 118581743449 is 344357.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 46364855625 + 72216887824 = 215325^2 + 268732^2 .

It is not a de Polignac number, because 118581743449 - 2²³ = 118573354841 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 118581743449.

It is not an unprimeable number, because it can be changed into a prime (118581743443) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4463397 + ... + 4489885.

Almost surely, 2^118581743449 is an apocalyptic number.

118581743449 is the 344357-th square number.

118581743449 is the 172179-th centered octagonal number.

It is an amenable number.

118581743449 is a deficient number, since it is larger than the sum of its proper divisors (9828187364).

118581743449 is an frugal number, since it uses more digits than its factorization.

118581743449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53004 (or 26502 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 55.

The spelling of 118581743449 in words is "one hundred eighteen billion, five hundred eighty-one million, seven hundred forty-three thousand, four hundred forty-nine".