216956687346 has 24 divisors (see below), whose sum is σ = 537226083264. Its totient is φ = 61987624920.

The previous prime is 216956687333. The next prime is 216956687347. The reversal of 216956687346 is 643786659612.

216956687346 is a `hidden beast` number, since 2 + 1 + 69 + 566 + 8 + 7 + 3 + 4 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (216956687347) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 860939110 + ... + 860939361.

It is an arithmetic number, because the mean of its divisors is an integer number (22384420136).

Almost surely, 2^216956687346 is an apocalyptic number.

216956687346 is an abundant number, since it is smaller than the sum of its proper divisors (320269395918).

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

216956687346 is a wasteful number, since it uses less digits than its factorization.

216956687346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1721878486 (or 1721878483 counting only the distinct ones).

The product of its digits is 78382080, while the sum is 63.

The spelling of 216956687346 in words is "two hundred sixteen billion, nine hundred fifty-six million, six hundred eighty-seven thousand, three hundred forty-six".