51717432551 has 4 divisors (see below), whose sum is σ = 52340534232. Its totient is φ = 51094330872.

The previous prime is 51717432517. The next prime is 51717432577. The reversal of 51717432551 is 15523471715.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51717432551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51717432499 and 51717432508.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 311550716 + ... + 311550881.

It is an arithmetic number, because the mean of its divisors is an integer number (13085133558).

Almost surely, 2^51717432551 is an apocalyptic number.

51717432551 is a deficient number, since it is larger than the sum of its proper divisors (623101681).

51717432551 is an equidigital number, since it uses as much as digits as its factorization.

51717432551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623101680.

The product of its digits is 147000, while the sum is 41.

The spelling of 51717432551 in words is "fifty-one billion, seven hundred seventeen million, four hundred thirty-two thousand, five hundred fifty-one".