2173834718449 has 9 divisors (see below), whose sum is σ = 2309255894497. Its totient is φ = 2045938497664.

The previous prime is 2173834718437. The next prime is 2173834718479. The reversal of 2173834718449 is 9448174383712.

It is a happy number.

The square root of 2173834718449 is 1474393.

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 311068330225 + 1862766388224 = 557735^2 + 1364832^2 .

It is not a de Polignac number, because 2173834718449 - 2⁵ = 2173834718417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2173834718479) 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, 25021317 + ... + 25108045.

Almost surely, 2^{2173834718449} is an apocalyptic number.

2173834718449 is the 1474393-rd square number.

2173834718449 is the 737197-th centered octagonal number.

It is an amenable number.

2173834718449 is a deficient number, since it is larger than the sum of its proper divisors (135421176048).

2173834718449 is an frugal number, since it uses more digits than its factorization.

2173834718449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173492 (or 86746 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 61.

The spelling of 2173834718449 in words is "two trillion, one hundred seventy-three billion, eight hundred thirty-four million, seven hundred eighteen thousand, four hundred forty-nine".