1216018575215 has 4 divisors (see below), whose sum is σ = 1459222290264. Its totient is φ = 972814860168.

The previous prime is 1216018575143. The next prime is 1216018575241. The reversal of 1216018575215 is 5125758106121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1216018575215 - 2⁸ = 1216018574959 is a prime.

It is a super-2 number, since 2×1216018575215² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121601857517 + ... + 121601857526.

It is an arithmetic number, because the mean of its divisors is an integer number (364805572566).

Almost surely, 2^{1216018575215} is an apocalyptic number.

1216018575215 is a deficient number, since it is larger than the sum of its proper divisors (243203715049).

1216018575215 is an equidigital number, since it uses as much as digits as its factorization.

1216018575215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243203715048.

The product of its (nonzero) digits is 168000, while the sum is 44.

The spelling of 1216018575215 in words is "one trillion, two hundred sixteen billion, eighteen million, five hundred seventy-five thousand, two hundred fifteen".