51666475 has 12 divisors (see below), whose sum is σ = 73219024. Its totient is φ = 35428320.

The previous prime is 51666473. The next prime is 51666479. The reversal of 51666475 is 57466615.

51666475 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51666475 - 2¹ = 51666473 is a prime.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51666473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147444 + ... + 147793.

Almost surely, 2^51666475 is an apocalyptic number.

51666475 is a deficient number, since it is larger than the sum of its proper divisors (21552549).

51666475 is a wasteful number, since it uses less digits than its factorization.

51666475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295254 (or 295249 counting only the distinct ones).

The product of its digits is 151200, while the sum is 40.

The square root of 51666475 is about 7187.9395517770. The cubic root of 51666475 is about 372.4513997522.

The spelling of 51666475 in words is "fifty-one million, six hundred sixty-six thousand, four hundred seventy-five".