51644251503617 has 2 divisors, whose sum is σ = 51644251503618. Its totient is φ = 51644251503616.

The previous prime is 51644251503529. The next prime is 51644251503643. The reversal of 51644251503617 is 71630515244615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50970446930881 + 673804572736 = 7139359^2 + 820856^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51644251503617 is a prime.

It is not a weakly prime, because it can be changed into another prime (51644251553617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25822125751808 + 25822125751809.

It is an arithmetic number, because the mean of its divisors is an integer number (25822125751809).

Almost surely, 2^{51644251503617} is an apocalyptic number.

It is an amenable number.

51644251503617 is a deficient number, since it is larger than the sum of its proper divisors (1).

51644251503617 is an equidigital number, since it uses as much as digits as its factorization.

51644251503617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024000, while the sum is 50.

The spelling of 51644251503617 in words is "fifty-one trillion, six hundred forty-four billion, two hundred fifty-one million, five hundred three thousand, six hundred seventeen".