51871685337 has 40 divisors (see below), whose sum is σ = 79789534440. Its totient is φ = 33562460160.

The previous prime is 51871685321. The next prime is 51871685381. The reversal of 51871685337 is 73358617815.

51871685337 is a `hidden beast` number, since 518 + 7 + 16 + 85 + 3 + 37 = 666.

51871685337 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 355850496 + 51515834841 = 18864^2 + 226971^2 .

It is not a de Polignac number, because 51871685337 - 2⁴ = 51871685321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51871685237) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 600489 + ... + 681417.

It is an arithmetic number, because the mean of its divisors is an integer number (1994738361).

Almost surely, 2^51871685337 is an apocalyptic number.

It is an amenable number.

51871685337 is a deficient number, since it is larger than the sum of its proper divisors (27917849103).

51871685337 is a wasteful number, since it uses less digits than its factorization.

51871685337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81175 (or 81166 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 54.

The spelling of 51871685337 in words is "fifty-one billion, eight hundred seventy-one million, six hundred eighty-five thousand, three hundred thirty-seven".