51666373 has 4 divisors (see below), whose sum is σ = 56363328. Its totient is φ = 46969420.

The previous prime is 51666347. The next prime is 51666379. The reversal of 51666373 is 37366615.

51666373 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51666373 - 2²⁵ = 18111941 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 (51666379) 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 3 ways as a sum of consecutive naturals, for example, 2348461 + ... + 2348482.

It is an arithmetic number, because the mean of its divisors is an integer number (14090832).

Almost surely, 2^51666373 is an apocalyptic number.

It is an amenable number.

51666373 is a deficient number, since it is larger than the sum of its proper divisors (4696955).

51666373 is a wasteful number, since it uses less digits than its factorization.

51666373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4696954.

The product of its digits is 68040, while the sum is 37.

The square root of 51666373 is about 7187.9324565552. The cubic root of 51666373 is about 372.4511546541.

The spelling of 51666373 in words is "fifty-one million, six hundred sixty-six thousand, three hundred seventy-three".