666254371 has 2 divisors, whose sum is σ = 666254372. Its totient is φ = 666254370.

The previous prime is 666254357. The next prime is 666254401. The reversal of 666254371 is 173452666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666254371 - 2⁵ = 666254339 is a prime.

It is not a weakly prime, because it can be changed into another prime (666254471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333127185 + 333127186.

It is an arithmetic number, because the mean of its divisors is an integer number (333127186).

Almost surely, 2^666254371 is an apocalyptic number.

666254371 is a deficient number, since it is larger than the sum of its proper divisors (1).

666254371 is an equidigital number, since it uses as much as digits as its factorization.

666254371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 40.

The square root of 666254371 is about 25811.9036686564. The cubic root of 666254371 is about 873.4003408790.

The spelling of 666254371 in words is "six hundred sixty-six million, two hundred fifty-four thousand, three hundred seventy-one".