11449165621 has 2 divisors, whose sum is σ = 11449165622. Its totient is φ = 11449165620.

The previous prime is 11449165571. The next prime is 11449165667. The reversal of 11449165621 is 12656194411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11302028721 + 147136900 = 106311^2 + 12130^2 .

It is a cyclic number.

It is not a de Polignac number, because 11449165621 - 2²⁵ = 11415611189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11449165691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5724582810 + 5724582811.

It is an arithmetic number, because the mean of its divisors is an integer number (5724582811).

Almost surely, 2^11449165621 is an apocalyptic number.

It is an amenable number.

11449165621 is a deficient number, since it is larger than the sum of its proper divisors (1).

11449165621 is an equidigital number, since it uses as much as digits as its factorization.

11449165621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 40.

The spelling of 11449165621 in words is "eleven billion, four hundred forty-nine million, one hundred sixty-five thousand, six hundred twenty-one".