1215502205105 has 4 divisors (see below), whose sum is σ = 1458602646132. Its totient is φ = 972401764080.

The previous prime is 1215502205059. The next prime is 1215502205167. The reversal of 1215502205105 is 5015022055121.

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 255972247969 + 959529957136 = 505937^2 + 979556^2 .

It is not a de Polignac number, because 1215502205105 - 2⁶ = 1215502205041 is a prime.

It is a super-2 number, since 2×1215502205105² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121550220506 + ... + 121550220515.

It is an arithmetic number, because the mean of its divisors is an integer number (364650661533).

Almost surely, 2^{1215502205105} is an apocalyptic number.

It is an amenable number.

1215502205105 is a deficient number, since it is larger than the sum of its proper divisors (243100441027).

1215502205105 is an equidigital number, since it uses as much as digits as its factorization.

1215502205105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243100441026.

The product of its (nonzero) digits is 5000, while the sum is 29.

The spelling of 1215502205105 in words is "one trillion, two hundred fifteen billion, five hundred two million, two hundred five thousand, one hundred five".