17720547253 has 2 divisors, whose sum is σ = 17720547254. Its totient is φ = 17720547252.

The previous prime is 17720547223. The next prime is 17720547269. The reversal of 17720547253 is 35274502771.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16956467089 + 764080164 = 130217^2 + 27642^2 .

It is an emirp because it is prime and its reverse (35274502771) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17720547253 - 2⁹ = 17720546741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17720547223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8860273626 + 8860273627.

It is an arithmetic number, because the mean of its divisors is an integer number (8860273627).

Almost surely, 2^17720547253 is an apocalyptic number.

It is an amenable number.

17720547253 is a deficient number, since it is larger than the sum of its proper divisors (1).

17720547253 is an equidigital number, since it uses as much as digits as its factorization.

17720547253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 411600, while the sum is 43.

The spelling of 17720547253 in words is "seventeen billion, seven hundred twenty million, five hundred forty-seven thousand, two hundred fifty-three".