9917418641 has 4 divisors (see below), whose sum is σ = 10680297012. Its totient is φ = 9154540272.

The previous prime is 9917418631. The next prime is 9917418653. The reversal of 9917418641 is 1468147199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1468147199 = 15349 ⋅95651.

It can be written as a sum of positive squares in 2 ways, for example, as 1574423041 + 8342995600 = 39679^2 + 91340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9917418641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 9917418641.

It is not an unprimeable number, because it can be changed into a prime (9917418601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381439166 + ... + 381439191.

It is an arithmetic number, because the mean of its divisors is an integer number (2670074253).

Almost surely, 2^9917418641 is an apocalyptic number.

It is an amenable number.

9917418641 is a deficient number, since it is larger than the sum of its proper divisors (762878371).

9917418641 is a wasteful number, since it uses less digits than its factorization.

9917418641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762878370.

The product of its digits is 435456, while the sum is 50.

The square root of 9917418641 is about 99586.2372067546. The cubic root of 9917418641 is about 2148.4877515040.

The spelling of 9917418641 in words is "nine billion, nine hundred seventeen million, four hundred eighteen thousand, six hundred forty-one".