51666379 has 2 divisors, whose sum is σ = 51666380. Its totient is φ = 51666378.

The previous prime is 51666347. The next prime is 51666389. The reversal of 51666379 is 97366615.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51666379 - 2⁵ = 51666347 is a prime.

It is not a weakly prime, because it can be changed into another prime (51666389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25833189 + 25833190.

It is an arithmetic number, because the mean of its divisors is an integer number (25833190).

Almost surely, 2^51666379 is an apocalyptic number.

51666379 is a deficient number, since it is larger than the sum of its proper divisors (1).

51666379 is an equidigital number, since it uses as much as digits as its factorization.

51666379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 43.

The square root of 51666379 is about 7187.9328739214. The cubic root of 51666379 is about 372.4511690716.

The spelling of 51666379 in words is "fifty-one million, six hundred sixty-six thousand, three hundred seventy-nine".