1645125275 has 18 divisors (see below), whose sum is σ = 2167020900. Its totient is φ = 1238677120.

The previous prime is 1645125271. The next prime is 1645125289. The reversal of 1645125275 is 5725215461.

It is not a de Polignac number, because 1645125275 - 2² = 1645125271 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1645125271) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 106625 + ... + 121074.

It is an arithmetic number, because the mean of its divisors is an integer number (120390050).

Almost surely, 2^1645125275 is an apocalyptic number.

1645125275 is a deficient number, since it is larger than the sum of its proper divisors (521895625).

1645125275 is a wasteful number, since it uses less digits than its factorization.

1645125275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227743 (or 227721 counting only the distinct ones).

The product of its digits is 84000, while the sum is 38.

The square root of 1645125275 is about 40560.1439223285. The cubic root of 1645125275 is about 1180.5009065073.

The spelling of 1645125275 in words is "one billion, six hundred forty-five million, one hundred twenty-five thousand, two hundred seventy-five".