51017201617 has 2 divisors, whose sum is σ = 51017201618. Its totient is φ = 51017201616.

The previous prime is 51017201539. The next prime is 51017201629. The reversal of 51017201617 is 71610271015.

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., 49312420096 + 1704781521 = 222064^2 + 41289^2 .

It is a cyclic number.

It is not a de Polignac number, because 51017201617 - 2³¹ = 48869717969 is a prime.

It is not a weakly prime, because it can be changed into another prime (51017201687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25508600808 + 25508600809.

It is an arithmetic number, because the mean of its divisors is an integer number (25508600809).

Almost surely, 2^51017201617 is an apocalyptic number.

It is an amenable number.

51017201617 is a deficient number, since it is larger than the sum of its proper divisors (1).

51017201617 is an equidigital number, since it uses as much as digits as its factorization.

51017201617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2940, while the sum is 31.

The spelling of 51017201617 in words is "fifty-one billion, seventeen million, two hundred one thousand, six hundred seventeen".