51891604717 has 16 divisors (see below), whose sum is σ = 52497510912. Its totient is φ = 51290205120.

The previous prime is 51891604697. The next prime is 51891604727. The reversal of 51891604717 is 71740619815.

It is a cyclic number.

It is not a de Polignac number, because 51891604717 - 2¹¹ = 51891602669 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 (51891604727) 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, 29037498 + ... + 29039284.

It is an arithmetic number, because the mean of its divisors is an integer number (3281094432).

Almost surely, 2^51891604717 is an apocalyptic number.

It is an amenable number.

51891604717 is a deficient number, since it is larger than the sum of its proper divisors (605906195).

51891604717 is a wasteful number, since it uses less digits than its factorization.

51891604717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2868.

The product of its (nonzero) digits is 423360, while the sum is 49.

The spelling of 51891604717 in words is "fifty-one billion, eight hundred ninety-one million, six hundred four thousand, seven hundred seventeen".