51801686271 has 20 divisors (see below), whose sum is σ = 78842824632. Its totient is φ = 33882861168.

The previous prime is 51801686257. The next prime is 51801686329. The reversal of 51801686271 is 17268610815.

51801686271 is a `hidden beast` number, since 5 + 1 + 8 + 0 + 16 + 8 + 627 + 1 = 666.

It is not a de Polignac number, because 51801686271 - 2¹⁸ = 51801424127 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51801686171) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6028981 + ... + 6037566.

Almost surely, 2^51801686271 is an apocalyptic number.

51801686271 is a deficient number, since it is larger than the sum of its proper divisors (27041138361).

51801686271 is a wasteful number, since it uses less digits than its factorization.

51801686271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12066612 (or 12066603 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 51801686271 in words is "fifty-one billion, eight hundred one million, six hundred eighty-six thousand, two hundred seventy-one".