1664445458 has 16 divisors (see below), whose sum is σ = 2715344856. Its totient is φ = 760598400.

The previous prime is 1664445457. The next prime is 1664445491. The reversal of 1664445458 is 8545444661.

It can be written as a sum of positive squares in 4 ways, for example, as 1142642809 + 521802649 = 33803^2 + 22843^2 .

It is not an unprimeable number, because it can be changed into a prime (1664445457) 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, 314291 + ... + 319542.

Almost surely, 2^1664445458 is an apocalyptic number.

1664445458 is a deficient number, since it is larger than the sum of its proper divisors (1050899398).

1664445458 is a wasteful number, since it uses less digits than its factorization.

1664445458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633949.

The product of its digits is 1843200, while the sum is 47.

The square root of 1664445458 is about 40797.6158372030. The cubic root of 1664445458 is about 1185.1041605225.

The spelling of 1664445458 in words is "one billion, six hundred sixty-four million, four hundred forty-five thousand, four hundred fifty-eight".