19623916552321 has 9 divisors (see below), whose sum is σ = 19688204176329. Its totient is φ = 19559838207936.

The previous prime is 19623916552277. The next prime is 19623916552337. The reversal of 19623916552321 is 12325561932691.

The square root of 19623916552321 is 4429889.

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

It can be written as a sum of positive squares in 4 ways, for example, as 10584032462721 + 9039884089600 = 3253311^2 + 3006640^2 .

It is not a de Polignac number, because 19623916552321 - 2⁷ = 19623916552193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19623916552391) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1386548181 + ... + 1386562333.

Almost surely, 2^{19623916552321} is an apocalyptic number.

19623916552321 is the 4429889-th square number.

19623916552321 is the 2214945-th centered octagonal number.

It is an amenable number.

19623916552321 is a deficient number, since it is larger than the sum of its proper divisors (64287624008).

19623916552321 is an frugal number, since it uses more digits than its factorization.

19623916552321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28932 (or 14466 counting only the distinct ones).

The product of its digits is 5248800, while the sum is 55.

The spelling of 19623916552321 in words is "nineteen trillion, six hundred twenty-three billion, nine hundred sixteen million, five hundred fifty-two thousand, three hundred twenty-one".