51781070671 has 16 divisors (see below), whose sum is σ = 60436310400. Its totient is φ = 43865042400.

The previous prime is 51781070659. The next prime is 51781070681. The reversal of 51781070671 is 17607018715.

It is a cyclic number.

It is not a de Polignac number, because 51781070671 - 2¹⁷ = 51780939599 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 (51781070651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2018041 + ... + 2043538.

It is an arithmetic number, because the mean of its divisors is an integer number (3777269400).

Almost surely, 2^51781070671 is an apocalyptic number.

51781070671 is a deficient number, since it is larger than the sum of its proper divisors (8655239729).

51781070671 is a wasteful number, since it uses less digits than its factorization.

51781070671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4061670.

The product of its (nonzero) digits is 82320, while the sum is 43.

The spelling of 51781070671 in words is "fifty-one billion, seven hundred eighty-one million, seventy thousand, six hundred seventy-one".