51721055071655 has 64 divisors (see below), whose sum is σ = 69273317923200. Its totient is φ = 36840831713280.

The previous prime is 51721055071613. The next prime is 51721055071661. The reversal of 51721055071655 is 55617055012715.

It is not a de Polignac number, because 51721055071655 - 2²⁸ = 51720786636199 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5985536135 + ... + 5985544775.

It is an arithmetic number, because the mean of its divisors is an integer number (1082395592550).

Almost surely, 2^{51721055071655} is an apocalyptic number.

51721055071655 is a deficient number, since it is larger than the sum of its proper divisors (17552262851545).

51721055071655 is a wasteful number, since it uses less digits than its factorization.

51721055071655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13524.

The product of its (nonzero) digits is 1837500, while the sum is 50.

The spelling of 51721055071655 in words is "fifty-one trillion, seven hundred twenty-one billion, fifty-five million, seventy-one thousand, six hundred fifty-five".