670545509 has 2 divisors, whose sum is σ = 670545510. Its totient is φ = 670545508.

The previous prime is 670545481. The next prime is 670545517. The reversal of 670545509 is 905545076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 495062500 + 175483009 = 22250^2 + 13247^2 .

It is a cyclic number.

It is not a de Polignac number, because 670545509 - 2¹⁶ = 670479973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (670545539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335272754 + 335272755.

It is an arithmetic number, because the mean of its divisors is an integer number (335272755).

Almost surely, 2^670545509 is an apocalyptic number.

It is an amenable number.

670545509 is a deficient number, since it is larger than the sum of its proper divisors (1).

670545509 is an equidigital number, since it uses as much as digits as its factorization.

670545509 is an evil number, because the sum of its binary digits is even.

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

The square root of 670545509 is about 25894.8934927333. The cubic root of 670545509 is about 875.2714299147.

The spelling of 670545509 in words is "six hundred seventy million, five hundred forty-five thousand, five hundred nine".