51717543019 has 4 divisors (see below), whose sum is σ = 51810393744. Its totient is φ = 51624692296.

The previous prime is 51717542983. The next prime is 51717543041. The reversal of 51717543019 is 91034571715.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51717543019 - 2¹⁷ = 51717411947 is a prime.

It is a super-2 number, since 2×51717543019² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51717543419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46424527 + ... + 46425640.

It is an arithmetic number, because the mean of its divisors is an integer number (12952598436).

Almost surely, 2^51717543019 is an apocalyptic number.

51717543019 is a deficient number, since it is larger than the sum of its proper divisors (92850725).

51717543019 is an equidigital number, since it uses as much as digits as its factorization.

51717543019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92850724.

The product of its (nonzero) digits is 132300, while the sum is 43.

The spelling of 51717543019 in words is "fifty-one billion, seven hundred seventeen million, five hundred forty-three thousand, nineteen".