204645442146391 has 2 divisors, whose sum is σ = 204645442146392. Its totient is φ = 204645442146390.

The previous prime is 204645442146373. The next prime is 204645442146511. The reversal of 204645442146391 is 193641244546402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 204645442146391 - 2⁷ = 204645442146263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204645442146091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102322721073195 + 102322721073196.

It is an arithmetic number, because the mean of its divisors is an integer number (102322721073196).

Almost surely, 2^{204645442146391} is an apocalyptic number.

204645442146391 is a deficient number, since it is larger than the sum of its proper divisors (1).

204645442146391 is an equidigital number, since it uses as much as digits as its factorization.

204645442146391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19906560, while the sum is 55.

The spelling of 204645442146391 in words is "two hundred four trillion, six hundred forty-five billion, four hundred forty-two million, one hundred forty-six thousand, three hundred ninety-one".