15215666065 has 8 divisors (see below), whose sum is σ = 18259761960. Its totient is φ = 12171891072.

The previous prime is 15215666033. The next prime is 15215666099. The reversal of 15215666065 is 56066651251.

15215666065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 912462849 + 14303203216 = 30207^2 + 119596^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 15215666065 - 2⁵ = 15215666033 is a prime.

It is an unprimeable number.

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, 40651 + ... + 179119.

It is an arithmetic number, because the mean of its divisors is an integer number (2282470245).

Almost surely, 2^15215666065 is an apocalyptic number.

It is an amenable number.

15215666065 is a deficient number, since it is larger than the sum of its proper divisors (3044095895).

15215666065 is a wasteful number, since it uses less digits than its factorization.

15215666065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160451.

The product of its (nonzero) digits is 324000, while the sum is 43.

The spelling of 15215666065 in words is "fifteen billion, two hundred fifteen million, six hundred sixty-six thousand, sixty-five".