219996645444 has 27 divisors (see below), whose sum is σ = 556109745373. Its totient is φ = 73331277072.

The previous prime is 219996645439. The next prime is 219996645551. The reversal of 219996645444 is 444546699912.

It is a happy number.

The square root of 219996645444 is 469038.

It is a perfect power (a square), and thus also a powerful number.

219996645444 is a `hidden beast` number, since 2 + 1 + 9 + 99 + 66 + 45 + 444 = 666.

It can be written as a sum of positive squares in only one way, i.e., 204041924100 + 15954721344 = 451710^2 + 126312^2 .

It is a super-2 number, since 2×219996645444² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2775142 + ... + 2853314.

Almost surely, 2^219996645444 is an apocalyptic number.

219996645444 is the 469038-th square number.

It is an amenable number.

219996645444 is an abundant number, since it is smaller than the sum of its proper divisors (336113099929).

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

219996645444 is an frugal number, since it uses more digits than its factorization.

219996645444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156356 (or 78178 counting only the distinct ones).

The product of its digits is 67184640, while the sum is 63.

The spelling of 219996645444 in words is "two hundred nineteen billion, nine hundred ninety-six million, six hundred forty-five thousand, four hundred forty-four".