1670438563 has 4 divisors (see below), whose sum is σ = 1672344160. Its totient is φ = 1668532968.

The previous prime is 1670438543. The next prime is 1670438591. The reversal of 1670438563 is 3658340761.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1670438563 - 2¹⁷ = 1670307491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1670438533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 951483 + ... + 953236.

It is an arithmetic number, because the mean of its divisors is an integer number (418086040).

Almost surely, 2^1670438563 is an apocalyptic number.

1670438563 is a deficient number, since it is larger than the sum of its proper divisors (1905597).

1670438563 is an equidigital number, since it uses as much as digits as its factorization.

1670438563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1905596.

The product of its (nonzero) digits is 362880, while the sum is 43.

The square root of 1670438563 is about 40870.9990457782. Note that the first 3 decimals coincide. The cubic root of 1670438563 is about 1186.5248431361.

The spelling of 1670438563 in words is "one billion, six hundred seventy million, four hundred thirty-eight thousand, five hundred sixty-three".