51666443 has 2 divisors, whose sum is σ = 51666444. Its totient is φ = 51666442.

The previous prime is 51666413. The next prime is 51666463. The reversal of 51666443 is 34466615.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51666443 - 2⁶ = 51666379 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51666403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25833221 + 25833222.

It is an arithmetic number, because the mean of its divisors is an integer number (25833222).

Almost surely, 2^51666443 is an apocalyptic number.

51666443 is a deficient number, since it is larger than the sum of its proper divisors (1).

51666443 is an equidigital number, since it uses as much as digits as its factorization.

51666443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 35.

The square root of 51666443 is about 7187.9373258258. The cubic root of 51666443 is about 372.4513228587.

The spelling of 51666443 in words is "fifty-one million, six hundred sixty-six thousand, four hundred forty-three".