219815438905 has 16 divisors (see below), whose sum is σ = 264144199824. Its totient is φ = 175608724480.

The previous prime is 219815438891. The next prime is 219815438939. The reversal of 219815438905 is 509834518912.

It can be written as a sum of positive squares in 8 ways, for example, as 952401321 + 218863037584 = 30861^2 + 467828^2 .

It is not a de Polignac number, because 219815438905 - 2⁵ = 219815438873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13960197 + ... + 13975933.

It is an arithmetic number, because the mean of its divisors is an integer number (16509012489).

Almost surely, 2^219815438905 is an apocalyptic number.

It is an amenable number.

219815438905 is a deficient number, since it is larger than the sum of its proper divisors (44328760919).

219815438905 is a wasteful number, since it uses less digits than its factorization.

219815438905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19436.

The product of its (nonzero) digits is 3110400, while the sum is 55.

The spelling of 219815438905 in words is "two hundred nineteen billion, eight hundred fifteen million, four hundred thirty-eight thousand, nine hundred five".