1216720715616 has 96 divisors (see below), whose sum is σ = 4055735738880. Its totient is φ = 347634488448.

The previous prime is 1216720715591. The next prime is 1216720715669. The reversal of 1216720715616 is 6165170276121.

1216720715616 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 7 + 20 + 7 + 1 + 5 + 616 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×1216720715616² (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 15 ways as a sum of consecutive naturals, for example, 100582636 + ... + 100594731.

It is an arithmetic number, because the mean of its divisors is an integer number (42247247280).

Almost surely, 2^{1216720715616} is an apocalyptic number.

1216720715616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1216720715616 is an abundant number, since it is smaller than the sum of its proper divisors (2839015023264).

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

1216720715616 is a wasteful number, since it uses less digits than its factorization.

1216720715616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201177393 (or 201177379 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The spelling of 1216720715616 in words is "one trillion, two hundred sixteen billion, seven hundred twenty million, seven hundred fifteen thousand, six hundred sixteen".