51261599017 has 2 divisors, whose sum is σ = 51261599018. Its totient is φ = 51261599016.

The previous prime is 51261598963. The next prime is 51261599027. The reversal of 51261599017 is 71099516215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49427960976 + 1833638041 = 222324^2 + 42821^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51261599017 is a prime.

It is not a weakly prime, because it can be changed into another prime (51261599027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25630799508 + 25630799509.

It is an arithmetic number, because the mean of its divisors is an integer number (25630799509).

Almost surely, 2^51261599017 is an apocalyptic number.

It is an amenable number.

51261599017 is a deficient number, since it is larger than the sum of its proper divisors (1).

51261599017 is an equidigital number, since it uses as much as digits as its factorization.

51261599017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 170100, while the sum is 46.

The spelling of 51261599017 in words is "fifty-one billion, two hundred sixty-one million, five hundred ninety-nine thousand, seventeen".