1216690623368 has 96 divisors (see below), whose sum is σ = 2614270982400. Its totient is φ = 529986737280.

The previous prime is 1216690623331. The next prime is 1216690623371. The reversal of 1216690623368 is 8633260966121.

It is a Cunningham number, because it is equal to 1103037²-1.

It is a super-3 number, since 3×1216690623368³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1930313 + ... + 2481831.

It is an arithmetic number, because the mean of its divisors is an integer number (27231989400).

Almost surely, 2^{1216690623368} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216690623368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1307135491200).

1216690623368 is an abundant number, since it is smaller than the sum of its proper divisors (1397580359032).

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

1216690623368 is a wasteful number, since it uses less digits than its factorization.

1216690623368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551643 (or 551628 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 53.

The spelling of 1216690623368 in words is "one trillion, two hundred sixteen billion, six hundred ninety million, six hundred twenty-three thousand, three hundred sixty-eight".