219859707664 has 15 divisors (see below), whose sum is σ = 425981817543. Its totient is φ = 109928916048.

The previous prime is 219859707631. The next prime is 219859707709. The reversal of 219859707664 is 466707958912.

The square root of 219859707664 is 468892.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 219859707596 and 219859707605.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1816957 + ... + 1934179.

Almost surely, 2^219859707664 is an apocalyptic number.

219859707664 is the 468892-nd square number.

It is an amenable number.

219859707664 is a deficient number, since it is larger than the sum of its proper divisors (206122109879).

219859707664 is an frugal number, since it uses more digits than its factorization.

219859707664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234454 (or 117225 counting only the distinct ones).

The product of its (nonzero) digits is 45722880, while the sum is 64.

Multiplying 219859707664 by its sum of digits (64), we get a square (14071021290496 = 3751136²).

The spelling of 219859707664 in words is "two hundred nineteen billion, eight hundred fifty-nine million, seven hundred seven thousand, six hundred sixty-four".