418121815117 has 4 divisors (see below), whose sum is σ = 418134775996. Its totient is φ = 418108854240.

The previous prime is 418121815109. The next prime is 418121815121. The reversal of 418121815117 is 711518121814.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 711518121814 = 2 ⋅355759060907.

It can be written as a sum of positive squares in 2 ways, for example, as 238931305636 + 179190509481 = 488806^2 + 423309^2 .

It is a cyclic number.

It is not a de Polignac number, because 418121815117 - 2³ = 418121815109 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 418121815117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (418121815127) 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, 6431928 + ... + 6496609.

It is an arithmetic number, because the mean of its divisors is an integer number (104533693999).

Almost surely, 2^418121815117 is an apocalyptic number.

It is an amenable number.

418121815117 is a deficient number, since it is larger than the sum of its proper divisors (12960879).

418121815117 is a wasteful number, since it uses less digits than its factorization.

418121815117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12960878.

The product of its digits is 17920, while the sum is 40.

The spelling of 418121815117 in words is "four hundred eighteen billion, one hundred twenty-one million, eight hundred fifteen thousand, one hundred seventeen".