219240040644 has 36 divisors (see below), whose sum is σ = 561781754716. Its totient is φ = 72078916608.

The previous prime is 219240040631. The next prime is 219240040651. The reversal of 219240040644 is 446040042912.

It is a happy number.

219240040644 is a `hidden beast` number, since 2 + 1 + 9 + 2 + 4 + 0 + 0 + 4 + 0 + 644 = 666.

219240040644 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 79185960000 + 140054080644 = 281400^2 + 374238^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 219240040599 and 219240040608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41709709 + ... + 41714964.

Almost surely, 2^219240040644 is an apocalyptic number.

It is an amenable number.

219240040644 is an abundant number, since it is smaller than the sum of its proper divisors (342541714072).

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

219240040644 is a wasteful number, since it uses less digits than its factorization.

219240040644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83424756 (or 83424751 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The spelling of 219240040644 in words is "two hundred nineteen billion, two hundred forty million, forty thousand, six hundred forty-four".