11621664834817 has 4 divisors (see below), whose sum is σ = 11671543224900. Its totient is φ = 11571786444736.

The previous prime is 11621664834811. The next prime is 11621664834851. The reversal of 11621664834817 is 71843846612611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5426737975296 + 6194926859521 = 2329536^2 + 2488961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11621664834817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11621664834811) 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, 24939194692 + ... + 24939195157.

It is an arithmetic number, because the mean of its divisors is an integer number (2917885806225).

Almost surely, 2^{11621664834817} is an apocalyptic number.

It is an amenable number.

11621664834817 is a deficient number, since it is larger than the sum of its proper divisors (49878390083).

11621664834817 is an equidigital number, since it uses as much as digits as its factorization.

11621664834817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49878390082.

The product of its digits is 9289728, while the sum is 58.

The spelling of 11621664834817 in words is "eleven trillion, six hundred twenty-one billion, six hundred sixty-four million, eight hundred thirty-four thousand, eight hundred seventeen".