666755051 has 2 divisors, whose sum is σ = 666755052. Its totient is φ = 666755050.

The previous prime is 666755041. The next prime is 666755053. The reversal of 666755051 is 150557666.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666755051 is a prime.

Together with 666755053, 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 (666755053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333377525 + 333377526.

It is an arithmetic number, because the mean of its divisors is an integer number (333377526).

Almost surely, 2^666755051 is an apocalyptic number.

666755051 is a deficient number, since it is larger than the sum of its proper divisors (1).

666755051 is an equidigital number, since it uses as much as digits as its factorization.

666755051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 189000, while the sum is 41.

The square root of 666755051 is about 25821.6004732472. The cubic root of 666755051 is about 873.6190684439.

The spelling of 666755051 in words is "six hundred sixty-six million, seven hundred fifty-five thousand, fifty-one".