51317327617 has 12 divisors (see below), whose sum is σ = 52620034048. Its totient is φ = 50046141600.

The previous prime is 51317327591. The next prime is 51317327641. The reversal of 51317327617 is 71672371315.

It is a de Polignac number, because none of the positive numbers 2^k-51317327617 is a prime.

It is a super-2 number, since 2×51317327617² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51317327717) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6260992 + ... + 6269182.

Almost surely, 2^51317327617 is an apocalyptic number.

It is an amenable number.

51317327617 is a deficient number, since it is larger than the sum of its proper divisors (1302706431).

51317327617 is an equidigital number, since it uses as much as digits as its factorization.

51317327617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12000 (or 11959 counting only the distinct ones).

The product of its digits is 185220, while the sum is 43.

The spelling of 51317327617 in words is "fifty-one billion, three hundred seventeen million, three hundred twenty-seven thousand, six hundred seventeen".