219916782397 has 4 divisors (see below), whose sum is σ = 236833457980. Its totient is φ = 203000106816.

The previous prime is 219916782353. The next prime is 219916782413. The reversal of 219916782397 is 793287619912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 151405813881 + 68510968516 = 389109^2 + 261746^2 .

It is not a de Polignac number, because 219916782397 - 2⁷ = 219916782269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (219916782347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8458337772 + ... + 8458337797.

It is an arithmetic number, because the mean of its divisors is an integer number (59208364495).

Almost surely, 2^219916782397 is an apocalyptic number.

It is an amenable number.

219916782397 is a deficient number, since it is larger than the sum of its proper divisors (16916675583).

219916782397 is a wasteful number, since it uses less digits than its factorization.

219916782397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16916675582.

The product of its digits is 20575296, while the sum is 64.

The spelling of 219916782397 in words is "two hundred nineteen billion, nine hundred sixteen million, seven hundred eighty-two thousand, three hundred ninety-seven".