666471457 has 2 divisors, whose sum is σ = 666471458. Its totient is φ = 666471456.

The previous prime is 666471439. The next prime is 666471461. The reversal of 666471457 is 754174666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 438944401 + 227527056 = 20951^2 + 15084^2 .

It is a cyclic number.

It is not a de Polignac number, because 666471457 - 2⁷ = 666471329 is a prime.

It is not a weakly prime, because it can be changed into another prime (666471467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333235728 + 333235729.

It is an arithmetic number, because the mean of its divisors is an integer number (333235729).

Almost surely, 2^666471457 is an apocalyptic number.

It is an amenable number.

666471457 is a deficient number, since it is larger than the sum of its proper divisors (1).

666471457 is an equidigital number, since it uses as much as digits as its factorization.

666471457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 46.

The square root of 666471457 is about 25816.1084790098. The cubic root of 666471457 is about 873.4951907369.

The spelling of 666471457 in words is "six hundred sixty-six million, four hundred seventy-one thousand, four hundred fifty-seven".