216706191692744 has 128 divisors (see below), whose sum is σ = 446626861480800. Its totient is φ = 97974166118400.

The previous prime is 216706191692719. The next prime is 216706191692839. The reversal of 216706191692744 is 447296191607612.

It can be written as a sum of positive squares in 16 ways, for example, as 109230465990244 + 107475725702500 = 10451338^2 + 10367050^2 .

It is a super-2 number, since 2×216706191692744² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 774981884 + ... + 775261460.

Almost surely, 2^{216706191692744} 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 216706191692744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223313430740400).

216706191692744 is an abundant number, since it is smaller than the sum of its proper divisors (229920669788056).

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

216706191692744 is a wasteful number, since it uses less digits than its factorization.

216706191692744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280483 (or 280479 counting only the distinct ones).

The product of its (nonzero) digits is 54867456, while the sum is 65.

The spelling of 216706191692744 in words is "two hundred sixteen trillion, seven hundred six billion, one hundred ninety-one million, six hundred ninety-two thousand, seven hundred forty-four".