51671144687 has 4 divisors (see below), whose sum is σ = 51902854080. Its totient is φ = 51439435296.

The previous prime is 51671144669. The next prime is 51671144711. The reversal of 51671144687 is 78644117615.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51671144687 - 2¹⁶ = 51671079151 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 (51671144617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115854362 + ... + 115854807.

It is an arithmetic number, because the mean of its divisors is an integer number (12975713520).

Almost surely, 2^51671144687 is an apocalyptic number.

51671144687 is a deficient number, since it is larger than the sum of its proper divisors (231709393).

51671144687 is a wasteful number, since it uses less digits than its factorization.

51671144687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231709392.

The product of its digits is 1128960, while the sum is 50.

The spelling of 51671144687 in words is "fifty-one billion, six hundred seventy-one million, one hundred forty-four thousand, six hundred eighty-seven".