205447320677 has 2 divisors, whose sum is σ = 205447320678. Its totient is φ = 205447320676.

The previous prime is 205447320671. The next prime is 205447320703. The reversal of 205447320677 is 776023744502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196378377316 + 9068943361 = 443146^2 + 95231^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205447320677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205447320671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102723660338 + 102723660339.

It is an arithmetic number, because the mean of its divisors is an integer number (102723660339).

Almost surely, 2^205447320677 is an apocalyptic number.

It is an amenable number.

205447320677 is a deficient number, since it is larger than the sum of its proper divisors (1).

205447320677 is an equidigital number, since it uses as much as digits as its factorization.

205447320677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1975680, while the sum is 47.

The spelling of 205447320677 in words is "two hundred five billion, four hundred forty-seven million, three hundred twenty thousand, six hundred seventy-seven".