1645043266 has 8 divisors (see below), whose sum is σ = 2468162700. Its totient is φ = 822322368.

The previous prime is 1645043263. The next prime is 1645043269. The reversal of 1645043266 is 6623405461.

It is an interprime number because it is at equal distance from previous prime (1645043263) and next prime (1645043269).

It can be written as a sum of positive squares in 2 ways, for example, as 1644708025 + 335241 = 40555^2 + 579^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1645043263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89091 + ... + 105958.

Almost surely, 2^1645043266 is an apocalyptic number.

1645043266 is a deficient number, since it is larger than the sum of its proper divisors (823119434).

1645043266 is a wasteful number, since it uses less digits than its factorization.

1645043266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199268.

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 1645043266 is about 40559.1329542435. The cubic root of 1645043266 is about 1180.4812903097.

The spelling of 1645043266 in words is "one billion, six hundred forty-five million, forty-three thousand, two hundred sixty-six".