172320381643 has 2 divisors, whose sum is σ = 172320381644. Its totient is φ = 172320381642.

The previous prime is 172320381637. The next prime is 172320381647. The reversal of 172320381643 is 346183023271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172320381643 - 2²⁵ = 172286827211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 172320381596 and 172320381605.

It is not a weakly prime, because it can be changed into another prime (172320381647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86160190821 + 86160190822.

It is an arithmetic number, because the mean of its divisors is an integer number (86160190822).

Almost surely, 2^172320381643 is an apocalyptic number.

172320381643 is a deficient number, since it is larger than the sum of its proper divisors (1).

172320381643 is an equidigital number, since it uses as much as digits as its factorization.

172320381643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 40.

The spelling of 172320381643 in words is "one hundred seventy-two billion, three hundred twenty million, three hundred eighty-one thousand, six hundred forty-three".