51666673 has 4 divisors (see below), whose sum is σ = 52043940. Its totient is φ = 51289408.

The previous prime is 51666649. The next prime is 51666707. The reversal of 51666673 is 37666615.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35247969 + 16418704 = 5937^2 + 4052^2 .

It is a cyclic number.

It is not a de Polignac number, because 51666673 - 2²¹ = 49569521 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188428 + ... + 188701.

It is an arithmetic number, because the mean of its divisors is an integer number (13010985).

Almost surely, 2^51666673 is an apocalyptic number.

It is an amenable number.

51666673 is a deficient number, since it is larger than the sum of its proper divisors (377267).

51666673 is a wasteful number, since it uses less digits than its factorization.

51666673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377266.

The product of its digits is 136080, while the sum is 40.

The square root of 51666673 is about 7187.9533248345. The cubic root of 51666673 is about 372.4518755300.

The spelling of 51666673 in words is "fifty-one million, six hundred sixty-six thousand, six hundred seventy-three".