1215550005513 has 4 divisors (see below), whose sum is σ = 1620733340688. Its totient is φ = 810366670340.

The previous prime is 1215550005503. The next prime is 1215550005521. The reversal of 1215550005513 is 3155000555121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1215550005513 - 2¹⁶ = 1215549939977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1215550005503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202591667583 + ... + 202591667588.

It is an arithmetic number, because the mean of its divisors is an integer number (405183335172).

Almost surely, 2^{1215550005513} is an apocalyptic number.

It is an amenable number.

1215550005513 is a deficient number, since it is larger than the sum of its proper divisors (405183335175).

1215550005513 is an equidigital number, since it uses as much as digits as its factorization.

1215550005513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405183335174.

The product of its (nonzero) digits is 18750, while the sum is 33.

The spelling of 1215550005513 in words is "one trillion, two hundred fifteen billion, five hundred fifty million, five thousand, five hundred thirteen".