1216445505480 has 128 divisors (see below), whose sum is σ = 4149116611200. Its totient is φ = 316841607936.

The previous prime is 1216445505463. The next prime is 1216445505551. The reversal of 1216445505480 is 845055446121.

1216445505480 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 44 + 550 + 54 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 31 ways as a sum of consecutive naturals, for example, 13050519 + ... + 13143398.

It is an arithmetic number, because the mean of its divisors is an integer number (32414973525).

Almost surely, 2^{1216445505480} is an apocalyptic number.

1216445505480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216445505480 is an abundant number, since it is smaller than the sum of its proper divisors (2932671105720).

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

1216445505480 is a wasteful number, since it uses less digits than its factorization.

1216445505480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26193980 (or 26193970 counting only the distinct ones).

The product of its (nonzero) digits is 768000, while the sum is 45.

The spelling of 1216445505480 in words is "one trillion, two hundred sixteen billion, four hundred forty-five million, five hundred five thousand, four hundred eighty".