7918353997849 has 27 divisors (see below), whose sum is σ = 8656850027007. Its totient is φ = 7241504478768.

The previous prime is 7918353997847. The next prime is 7918353997891. The reversal of 7918353997849 is 9487993538197.

The square root of 7918353997849 is 2813957.

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

It can be written as a sum of positive squares in only one way, i.e., 4152192762249 + 3766161235600 = 2037693^2 + 1940660^2 .

It is not a de Polignac number, because 7918353997849 - 2¹ = 7918353997847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7918353997847) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1550487754 + ... + 1550492860.

Almost surely, 2^{7918353997849} is an apocalyptic number.

7918353997849 is the 2813957-th square number.

7918353997849 is the 1406979-th centered octagonal number.

It is an amenable number.

7918353997849 is a deficient number, since it is larger than the sum of its proper divisors (738496029158).

7918353997849 is an frugal number, since it uses more digits than its factorization.

7918353997849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10310 (or 5155 counting only the distinct ones).

The product of its digits is 3703553280, while the sum is 82.

The spelling of 7918353997849 in words is "seven trillion, nine hundred eighteen billion, three hundred fifty-three million, nine hundred ninety-seven thousand, eight hundred forty-nine".