216447705486366 has 64 divisors (see below), whose sum is σ = 445411528319808. Its totient is φ = 70070441084928.

The previous prime is 216447705486349. The next prime is 216447705486367. The reversal of 216447705486366 is 663684507744612.

It is a super-2 number, since 2×216447705486366² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216447705486366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216447705486367) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 480047020 + ... + 480497696.

It is an arithmetic number, because the mean of its divisors is an integer number (6959555129997).

Almost surely, 2^{216447705486366} is an apocalyptic number.

216447705486366 is an abundant number, since it is smaller than the sum of its proper divisors (228963822833442).

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

216447705486366 is a wasteful number, since it uses less digits than its factorization.

216447705486366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454685.

The product of its (nonzero) digits is 975421440, while the sum is 69.

The spelling of 216447705486366 in words is "two hundred sixteen trillion, four hundred forty-seven billion, seven hundred five million, four hundred eighty-six thousand, three hundred sixty-six".