53709204918517 has 2 divisors, whose sum is σ = 53709204918518. Its totient is φ = 53709204918516.

The previous prime is 53709204918503. The next prime is 53709204918601. The reversal of 53709204918517 is 71581940290735.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28100028494916 + 25609176423601 = 5300946^2 + 5060551^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53709204918517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53709204918617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26854602459258 + 26854602459259.

It is an arithmetic number, because the mean of its divisors is an integer number (26854602459259).

Almost surely, 2^{53709204918517} is an apocalyptic number.

It is an amenable number.

53709204918517 is a deficient number, since it is larger than the sum of its proper divisors (1).

53709204918517 is an equidigital number, since it uses as much as digits as its factorization.

53709204918517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19051200, while the sum is 61.

The spelling of 53709204918517 in words is "fifty-three trillion, seven hundred nine billion, two hundred four million, nine hundred eighteen thousand, five hundred seventeen".