51520016441 has 2 divisors, whose sum is σ = 51520016442. Its totient is φ = 51520016440.

The previous prime is 51520016411. The next prime is 51520016479. The reversal of 51520016441 is 14461002515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51510841600 + 9174841 = 226960^2 + 3029^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51520016441 is a prime.

It is not a weakly prime, because it can be changed into another prime (51520016411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25760008220 + 25760008221.

It is an arithmetic number, because the mean of its divisors is an integer number (25760008221).

Almost surely, 2^51520016441 is an apocalyptic number.

It is an amenable number.

51520016441 is a deficient number, since it is larger than the sum of its proper divisors (1).

51520016441 is an equidigital number, since it uses as much as digits as its factorization.

51520016441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 51520016441 its reverse (14461002515), we get a palindrome (65981018956).

The spelling of 51520016441 in words is "fifty-one billion, five hundred twenty million, sixteen thousand, four hundred forty-one".