666755251 has 2 divisors, whose sum is σ = 666755252. Its totient is φ = 666755250.

The previous prime is 666755213. The next prime is 666755267. The reversal of 666755251 is 152557666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666755251 - 2¹¹ = 666753203 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666755198 and 666755207.

It is not a weakly prime, because it can be changed into another prime (666755051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333377625 + 333377626.

It is an arithmetic number, because the mean of its divisors is an integer number (333377626).

Almost surely, 2^666755251 is an apocalyptic number.

666755251 is a deficient number, since it is larger than the sum of its proper divisors (1).

666755251 is an equidigital number, since it uses as much as digits as its factorization.

666755251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378000, while the sum is 43.

The square root of 666755251 is about 25821.6043459735. The cubic root of 666755251 is about 873.6191557942.

The spelling of 666755251 in words is "six hundred sixty-six million, seven hundred fifty-five thousand, two hundred fifty-one".