216686777877702 has 96 divisors (see below), whose sum is σ = 514458171227520. Its totient is φ = 65369181461760.

The previous prime is 216686777877697. The next prime is 216686777877721. The reversal of 216686777877702 is 207778777686612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 735573813 + ... + 735868335.

It is an arithmetic number, because the mean of its divisors is an integer number (5358939283620).

Almost surely, 2^{216686777877702} is an apocalyptic number.

216686777877702 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 216686777877702, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257229085613760).

216686777877702 is an abundant number, since it is smaller than the sum of its proper divisors (297771393349818).

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

216686777877702 is a wasteful number, since it uses less digits than its factorization.

216686777877702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311138 (or 311135 counting only the distinct ones).

The product of its (nonzero) digits is 6505519104, while the sum is 81.

The spelling of 216686777877702 in words is "two hundred sixteen trillion, six hundred eighty-six billion, seven hundred seventy-seven million, eight hundred seventy-seven thousand, seven hundred two".