1645503275 has 12 divisors (see below), whose sum is σ = 2197380192. Its totient is φ = 1215140640.

The previous prime is 1645503203. The next prime is 1645503347. The reversal of 1645503275 is 5723055461.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1645503203) and next prime (1645503347).

It is not a de Polignac number, because 1645503275 - 2¹⁰ = 1645502251 is a prime.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 2531219 + ... + 2531868.

It is an arithmetic number, because the mean of its divisors is an integer number (183115016).

Almost surely, 2^1645503275 is an apocalyptic number.

1645503275 is a deficient number, since it is larger than the sum of its proper divisors (551876917).

1645503275 is a wasteful number, since it uses less digits than its factorization.

1645503275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5063110 (or 5063105 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 38.

The square root of 1645503275 is about 40564.8034014711. The cubic root of 1645503275 is about 1180.5913140439.

The spelling of 1645503275 in words is "one billion, six hundred forty-five million, five hundred three thousand, two hundred seventy-five".