51721065516711 has 32 divisors (see below), whose sum is σ = 71834606706688. Its totient is φ = 33065545144320.

The previous prime is 51721065516683. The next prime is 51721065516739. The reversal of 51721065516711 is 11761556012715.

It is an interprime number because it is at equal distance from previous prime (51721065516683) and next prime (51721065516739).

It is not a de Polignac number, because 51721065516711 - 2¹⁸ = 51721065254567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51721065516811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 532551 + ... + 10184583.

It is an arithmetic number, because the mean of its divisors is an integer number (2244831459584).

Almost surely, 2^{51721065516711} is an apocalyptic number.

51721065516711 is a deficient number, since it is larger than the sum of its proper divisors (20113541189977).

51721065516711 is a wasteful number, since it uses less digits than its factorization.

51721065516711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9652591.

The product of its (nonzero) digits is 441000, while the sum is 48.

The spelling of 51721065516711 in words is "fifty-one trillion, seven hundred twenty-one billion, sixty-five million, five hundred sixteen thousand, seven hundred eleven".