51651551116671 has 16 divisors (see below), whose sum is σ = 75129687347328. Its totient is φ = 31303904352800.

The previous prime is 51651551116643. The next prime is 51651551116679. The reversal of 51651551116671 is 17661115515615.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51651551116671 - 2²⁶ = 51651484007807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51651551116679) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17576500 + ... + 20303606.

It is an arithmetic number, because the mean of its divisors is an integer number (4695605459208).

Almost surely, 2^{51651551116671} is an apocalyptic number.

51651551116671 is a deficient number, since it is larger than the sum of its proper divisors (23478136230657).

51651551116671 is a wasteful number, since it uses less digits than its factorization.

51651551116671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3301062.

The product of its digits is 945000, while the sum is 51.

It can be divided in two parts, 5165155 and 1116671, that added together give a palindrome (6281826).

The spelling of 51651551116671 in words is "fifty-one trillion, six hundred fifty-one billion, five hundred fifty-one million, one hundred sixteen thousand, six hundred seventy-one".