1218214550871 has 48 divisors (see below), whose sum is σ = 1961620633440. Its totient is φ = 723989145600.

The previous prime is 1218214550857. The next prime is 1218214550899. The reversal of 1218214550871 is 1780554128121.

1218214550871 is a `hidden beast` number, since 1 + 2 + 1 + 8 + 2 + 14 + 550 + 87 + 1 = 666.

1218214550871 is a nontrivial binomial coefficient, being equal to C(1560907, 2).

It is not a de Polignac number, because 1218214550871 - 2⁷ = 1218214550743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218214554871) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14787531 + ... + 14869683.

It is an arithmetic number, because the mean of its divisors is an integer number (40867096530).

Almost surely, 2^{1218214550871} is an apocalyptic number.

1218214550871 is the 1560906-th triangular number.

1218214550871 is a deficient number, since it is larger than the sum of its proper divisors (743406082569).

1218214550871 is a wasteful number, since it uses less digits than its factorization.

1218214550871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87296 (or 87293 counting only the distinct ones).

The product of its (nonzero) digits is 179200, while the sum is 45.

Adding to 1218214550871 its reverse (1780554128121), we get a palindrome (2998768678992).

The spelling of 1218214550871 in words is "one trillion, two hundred eighteen billion, two hundred fourteen million, five hundred fifty thousand, eight hundred seventy-one".