204637769343457 has 2 divisors, whose sum is σ = 204637769343458. Its totient is φ = 204637769343456.

The previous prime is 204637769343451. The next prime is 204637769343479. The reversal of 204637769343457 is 754343967736402.

It is a happy number.

204637769343457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204613685096976 + 24084246481 = 14304324^2 + 155191^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204637769343457 is a prime.

It is not a weakly prime, because it can be changed into another prime (204637769343451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102318884671728 + 102318884671729.

It is an arithmetic number, because the mean of its divisors is an integer number (102318884671729).

Almost surely, 2^{204637769343457} is an apocalyptic number.

It is an amenable number.

204637769343457 is a deficient number, since it is larger than the sum of its proper divisors (1).

204637769343457 is an equidigital number, since it uses as much as digits as its factorization.

204637769343457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920360960, while the sum is 70.

The spelling of 204637769343457 in words is "two hundred four trillion, six hundred thirty-seven billion, seven hundred sixty-nine million, three hundred forty-three thousand, four hundred fifty-seven".