1215665223 has 16 divisors (see below), whose sum is σ = 1727762400. Its totient is φ = 757646336.

The previous prime is 1215665221. The next prime is 1215665233. The reversal of 1215665223 is 3225665121.

It is a cyclic number.

It is not a de Polignac number, because 1215665223 - 2¹ = 1215665221 is a prime.

It is a super-3 number, since 3×1215665223³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215665221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72390 + ... + 87587.

It is an arithmetic number, because the mean of its divisors is an integer number (107985150).

Almost surely, 2^1215665223 is an apocalyptic number.

1215665223 is a deficient number, since it is larger than the sum of its proper divisors (512097177).

1215665223 is a wasteful number, since it uses less digits than its factorization.

1215665223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160146.

The product of its digits is 21600, while the sum is 33.

The square root of 1215665223 is about 34866.3910234484. The cubic root of 1215665223 is about 1067.2626987989.

The spelling of 1215665223 in words is "one billion, two hundred fifteen million, six hundred sixty-five thousand, two hundred twenty-three".