1643305475 has 12 divisors (see below), whose sum is σ = 2328798864. Its totient is φ = 1126837920.

The previous prime is 1643305423. The next prime is 1643305483. The reversal of 1643305475 is 5745033461.

It is not a de Polignac number, because 1643305475 - 2¹⁴ = 1643289091 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4694984 + ... + 4695333.

It is an arithmetic number, because the mean of its divisors is an integer number (194066572).

Almost surely, 2^1643305475 is an apocalyptic number.

1643305475 is a deficient number, since it is larger than the sum of its proper divisors (685493389).

1643305475 is an equidigital number, since it uses as much as digits as its factorization.

1643305475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9390334 (or 9390329 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 38.

The square root of 1643305475 is about 40537.7043627288. The cubic root of 1643305475 is about 1180.0654648637.

The spelling of 1643305475 in words is "one billion, six hundred forty-three million, three hundred five thousand, four hundred seventy-five".