1664825544 has 24 divisors (see below), whose sum is σ = 4508902710. Its totient is φ = 554941824.

The previous prime is 1664825531. The next prime is 1664825551. The reversal of 1664825544 is 4455284661.

It is a happy number.

1664825544 is a `hidden beast` number, since 1 + 66 + 48 + 2 + 5 + 544 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1575296100 + 89529444 = 39690^2 + 9462^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1664825544.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11561217 + ... + 11561360.

Almost surely, 2^1664825544 is an apocalyptic number.

It is an amenable number.

1664825544 is an abundant number, since it is smaller than the sum of its proper divisors (2844077166).

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

1664825544 is a wasteful number, since it uses less digits than its factorization.

1664825544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23122589 (or 23122582 counting only the distinct ones).

The product of its digits is 921600, while the sum is 45.

The square root of 1664825544 is about 40802.2737601717. The cubic root of 1664825544 is about 1185.1943621800.

The spelling of 1664825544 in words is "one billion, six hundred sixty-four million, eight hundred twenty-five thousand, five hundred forty-four".