216522745722 has 24 divisors (see below), whose sum is σ = 469215242964. Its totient is φ = 72161536704.

The previous prime is 216522745721. The next prime is 216522745759. The reversal of 216522745722 is 227547225612.

216522745722 is a `hidden beast` number, since 2 + 1 + 6 + 5 + 2 + 2 + 74 + 572 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 173096770401 + 43425975321 = 416049^2 + 208389^2 .

It is not an unprimeable number, because it can be changed into a prime (216522745721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 954003 + ... + 1158950.

Almost surely, 2^216522745722 is an apocalyptic number.

216522745722 is an abundant number, since it is smaller than the sum of its proper divisors (252692497242).

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

216522745722 is a wasteful number, since it uses less digits than its factorization.

216522745722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2118654 (or 2118651 counting only the distinct ones).

The product of its digits is 940800, while the sum is 45.

The spelling of 216522745722 in words is "two hundred sixteen billion, five hundred twenty-two million, seven hundred forty-five thousand, seven hundred twenty-two".