1664161408 has 64 divisors (see below), whose sum is σ = 4080424320. Its totient is φ = 658344960.

The previous prime is 1664161397. The next prime is 1664161409. The reversal of 1664161408 is 8041614661.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (1664161409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59788 + ... + 83083.

It is an arithmetic number, because the mean of its divisors is an integer number (63756630).

Almost surely, 2^1664161408 is an apocalyptic number.

It is an amenable number.

1664161408 is an abundant number, since it is smaller than the sum of its proper divisors (2416262912).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1664161408 is a wasteful number, since it uses less digits than its factorization.

1664161408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142905 (or 142893 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 1664161408 is about 40794.1344803392. The cubic root of 1664161408 is about 1185.0367410733.

The spelling of 1664161408 in words is "one billion, six hundred sixty-four million, one hundred sixty-one thousand, four hundred eight".