11615065221 has 8 divisors (see below), whose sum is σ = 15488159680. Its totient is φ = 7742673792.

The previous prime is 11615065219. The next prime is 11615065279. The reversal of 11615065221 is 12256051611.

11615065221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11615065221 - 2¹ = 11615065219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11615065291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135916 + ... + 204213.

It is an arithmetic number, because the mean of its divisors is an integer number (1936019960).

Almost surely, 2^11615065221 is an apocalyptic number.

It is an amenable number.

11615065221 is a deficient number, since it is larger than the sum of its proper divisors (3873094459).

11615065221 is a wasteful number, since it uses less digits than its factorization.

11615065221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351515.

The product of its (nonzero) digits is 3600, while the sum is 30.

The spelling of 11615065221 in words is "eleven billion, six hundred fifteen million, sixty-five thousand, two hundred twenty-one".