51666707 has 2 divisors, whose sum is σ = 51666708. Its totient is φ = 51666706.

The previous prime is 51666649. The next prime is 51666709. The reversal of 51666707 is 70766615.

51666707 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51666707 - 2¹⁴ = 51650323 is a prime.

It is a super-2 number, since 2×51666707² = 5338897224447698, which contains 22 as substring.

Together with 51666709, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51666709) 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 as a sum of consecutive naturals, namely, 25833353 + 25833354.

It is an arithmetic number, because the mean of its divisors is an integer number (25833354).

Almost surely, 2^51666707 is an apocalyptic number.

51666707 is a deficient number, since it is larger than the sum of its proper divisors (1).

51666707 is an equidigital number, since it uses as much as digits as its factorization.

51666707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 51666707 is about 7187.9556899024. The cubic root of 51666707 is about 372.4519572291.

The spelling of 51666707 in words is "fifty-one million, six hundred sixty-six thousand, seven hundred seven".