216565738084 has 12 divisors (see below), whose sum is σ = 379002211308. Its totient is φ = 108279392000.

The previous prime is 216565738069. The next prime is 216565738087. The reversal of 216565738084 is 480837565612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 31431744100 + 185133993984 = 177290^2 + 430272^2 .

It is not an unprimeable number, because it can be changed into a prime (216565738087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 726517 + ... + 980284.

It is an arithmetic number, because the mean of its divisors is an integer number (31583517609).

Almost surely, 2^216565738084 is an apocalyptic number.

It is an amenable number.

216565738084 is a deficient number, since it is larger than the sum of its proper divisors (162436473224).

216565738084 is a wasteful number, since it uses less digits than its factorization.

216565738084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1738526 (or 1738524 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 55.

The spelling of 216565738084 in words is "two hundred sixteen billion, five hundred sixty-five million, seven hundred thirty-eight thousand, eighty-four".