1216505402343 has 48 divisors (see below), whose sum is σ = 2261432788992. Its totient is φ = 611565336000.

The previous prime is 1216505402339. The next prime is 1216505402369. The reversal of 1216505402343 is 3432045056121.

1216505402343 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 50 + 540 + 23 + 43 = 666.

It is not a de Polignac number, because 1216505402343 - 2² = 1216505402339 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1216505402298 and 1216505402307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216505401343) 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, 28291728 + ... + 28334693.

It is an arithmetic number, because the mean of its divisors is an integer number (47113183104).

Almost surely, 2^{1216505402343} is an apocalyptic number.

1216505402343 is a deficient number, since it is larger than the sum of its proper divisors (1044927386649).

1216505402343 is a wasteful number, since it uses less digits than its factorization.

1216505402343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56626476 (or 56626473 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 1216505402343 in words is "one trillion, two hundred sixteen billion, five hundred five million, four hundred two thousand, three hundred forty-three".