666430245 has 24 divisors (see below), whose sum is σ = 1244004216. Its totient is φ = 328088448.

The previous prime is 666430231. The next prime is 666430279. The reversal of 666430245 is 542034666.

It can be written as a sum of positive squares in 4 ways, for example, as 75794436 + 590635809 = 8706^2 + 24303^2 .

It is not a de Polignac number, because 666430245 - 2⁶ = 666430181 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 569014 + ... + 570183.

It is an arithmetic number, because the mean of its divisors is an integer number (51833509).

Almost surely, 2^666430245 is an apocalyptic number.

666430245 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

666430245 is a deficient number, since it is larger than the sum of its proper divisors (577573971).

666430245 is a wasteful number, since it uses less digits than its factorization.

666430245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139221 (or 1139218 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 666430245 is about 25815.3102828535. The cubic root of 666430245 is about 873.4771858519.

The spelling of 666430245 in words is "six hundred sixty-six million, four hundred thirty thousand, two hundred forty-five".