51649536013 has 2 divisors, whose sum is σ = 51649536014. Its totient is φ = 51649536012.

The previous prime is 51649535933. The next prime is 51649536067. The reversal of 51649536013 is 31063594615.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25934847849 + 25714688164 = 161043^2 + 160358^2 .

It is a cyclic number.

It is not a de Polignac number, because 51649536013 - 2²¹ = 51647438861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51649536083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25824768006 + 25824768007.

It is an arithmetic number, because the mean of its divisors is an integer number (25824768007).

Almost surely, 2^51649536013 is an apocalyptic number.

It is an amenable number.

51649536013 is a deficient number, since it is larger than the sum of its proper divisors (1).

51649536013 is an equidigital number, since it uses as much as digits as its factorization.

51649536013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 291600, while the sum is 43.

The spelling of 51649536013 in words is "fifty-one billion, six hundred forty-nine million, five hundred thirty-six thousand, thirteen".