1216018562550 has 48 divisors (see below), whose sum is σ = 3289882951872. Its totient is φ = 294792378400.

The previous prime is 1216018562527. The next prime is 1216018562599. The reversal of 1216018562550 is 552658106121.

It is a super-2 number, since 2×1216018562550² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 368488824 + ... + 368492123.

It is an arithmetic number, because the mean of its divisors is an integer number (68539228164).

Almost surely, 2^{1216018562550} is an apocalyptic number.

1216018562550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216018562550 is an abundant number, since it is smaller than the sum of its proper divisors (2073864389322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1216018562550 is a wasteful number, since it uses less digits than its factorization.

1216018562550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736980973 (or 736980968 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 42.

The spelling of 1216018562550 in words is "one trillion, two hundred sixteen billion, eighteen million, five hundred sixty-two thousand, five hundred fifty".