1645673675 has 12 divisors (see below), whose sum is σ = 2068591560. Its totient is φ = 1298502720.

The previous prime is 1645673671. The next prime is 1645673707. The reversal of 1645673675 is 5763765461.

It is not a de Polignac number, because 1645673675 - 2² = 1645673671 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1645673671) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 449045 + ... + 452694.

It is an arithmetic number, because the mean of its divisors is an integer number (172382630).

Almost surely, 2^1645673675 is an apocalyptic number.

1645673675 is a deficient number, since it is larger than the sum of its proper divisors (422917885).

1645673675 is an equidigital number, since it uses as much as digits as its factorization.

1645673675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901822 (or 901817 counting only the distinct ones).

The product of its digits is 3175200, while the sum is 50.

The square root of 1645673675 is about 40566.9036900772. The cubic root of 1645673675 is about 1180.6320646599.

The spelling of 1645673675 in words is "one billion, six hundred forty-five million, six hundred seventy-three thousand, six hundred seventy-five".