216777697794 has 320 divisors, whose sum is σ = 596415156480. Its totient is φ = 57445355520.

The previous prime is 216777697757. The next prime is 216777697867. The reversal of 216777697794 is 497796777612.

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 159 ways as a sum of consecutive naturals, for example, 557268952 + ... + 557269340.

It is an arithmetic number, because the mean of its divisors is an integer number (1863797364).

Almost surely, 2^216777697794 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216777697794, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (298207578240).

216777697794 is an abundant number, since it is smaller than the sum of its proper divisors (379637458686).

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

216777697794 is a wasteful number, since it uses less digits than its factorization.

216777697794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775 (or 766 counting only the distinct ones).

The product of its digits is 392073696, while the sum is 72.

The spelling of 216777697794 in words is "two hundred sixteen billion, seven hundred seventy-seven million, six hundred ninety-seven thousand, seven hundred ninety-four".