1664813443 has 8 divisors (see below), whose sum is σ = 1699072560. Its totient is φ = 1630755840.

The previous prime is 1664813389. The next prime is 1664813477. The reversal of 1664813443 is 3443184661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1664813443 - 2²¹ = 1662716291 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1664813396 and 1664813405.

It is not an unprimeable number, because it can be changed into a prime (1664813543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33630 + ... + 66787.

It is an arithmetic number, because the mean of its divisors is an integer number (212384070).

Almost surely, 2^1664813443 is an apocalyptic number.

1664813443 is a deficient number, since it is larger than the sum of its proper divisors (34259117).

1664813443 is a wasteful number, since it uses less digits than its factorization.

1664813443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100757.

The product of its digits is 165888, while the sum is 40.

The square root of 1664813443 is about 40802.1254715977. The cubic root of 1664813443 is about 1185.1914905935.

The spelling of 1664813443 in words is "one billion, six hundred sixty-four million, eight hundred thirteen thousand, four hundred forty-three".