51666871 has 8 divisors (see below), whose sum is σ = 54588080. Its totient is φ = 48765888.

The previous prime is 51666851. The next prime is 51666887. The reversal of 51666871 is 17866615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51666871 - 2²¹ = 49569719 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 (51666821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355 + ... + 10171.

It is an arithmetic number, because the mean of its divisors is an integer number (6823510).

Almost surely, 2^51666871 is an apocalyptic number.

51666871 is a deficient number, since it is larger than the sum of its proper divisors (2921209).

51666871 is a wasteful number, since it uses less digits than its factorization.

51666871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10113.

The product of its digits is 60480, while the sum is 40.

The square root of 51666871 is about 7187.9670978657. The cubic root of 51666871 is about 372.4523513065.

The spelling of 51666871 in words is "fifty-one million, six hundred sixty-six thousand, eight hundred seventy-one".