51559619005421 has 2 divisors, whose sum is σ = 51559619005422. Its totient is φ = 51559619005420.

The previous prime is 51559619005399. The next prime is 51559619005441. The reversal of 51559619005421 is 12450091695515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36136797709321 + 15422821296100 = 6011389^2 + 3927190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51559619005421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51559619005441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25779809502710 + 25779809502711.

It is an arithmetic number, because the mean of its divisors is an integer number (25779809502711).

Almost surely, 2^{51559619005421} is an apocalyptic number.

It is an amenable number.

51559619005421 is a deficient number, since it is larger than the sum of its proper divisors (1).

51559619005421 is an equidigital number, since it uses as much as digits as its factorization.

51559619005421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430000, while the sum is 53.

The spelling of 51559619005421 in words is "fifty-one trillion, five hundred fifty-nine billion, six hundred nineteen million, five thousand, four hundred twenty-one".