666451573 has 2 divisors, whose sum is σ = 666451574. Its totient is φ = 666451572.

The previous prime is 666451567. The next prime is 666451579. The reversal of 666451573 is 375154666.

It is a balanced prime because it is at equal distance from previous prime (666451567) and next prime (666451579).

It can be written as a sum of positive squares in only one way, i.e., 639432369 + 27019204 = 25287^2 + 5198^2 .

It is a cyclic number.

It is not a de Polignac number, because 666451573 - 2¹³ = 666443381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666451579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333225786 + 333225787.

It is an arithmetic number, because the mean of its divisors is an integer number (333225787).

Almost surely, 2^666451573 is an apocalyptic number.

It is an amenable number.

666451573 is a deficient number, since it is larger than the sum of its proper divisors (1).

666451573 is an equidigital number, since it uses as much as digits as its factorization.

666451573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 453600, while the sum is 43.

The square root of 666451573 is about 25815.7233677463. The cubic root of 666451573 is about 873.4865038177.

The spelling of 666451573 in words is "six hundred sixty-six million, four hundred fifty-one thousand, five hundred seventy-three".