1664330425 has 24 divisors (see below), whose sum is σ = 2119051872. Its totient is φ = 1295952000.

The previous prime is 1664330407. The next prime is 1664330429. The reversal of 1664330425 is 5240334661.

It is not a de Polignac number, because 1664330425 - 2⁹ = 1664329913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1664330429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 501622 + ... + 504928.

It is an arithmetic number, because the mean of its divisors is an integer number (88293828).

Almost surely, 2^1664330425 is an apocalyptic number.

It is an amenable number.

1664330425 is a deficient number, since it is larger than the sum of its proper divisors (454721447).

1664330425 is a wasteful number, since it uses less digits than its factorization.

1664330425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3849 (or 3844 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 1664330425 is about 40796.2060123242. The cubic root of 1664330425 is about 1185.0768582906.

The spelling of 1664330425 in words is "one billion, six hundred sixty-four million, three hundred thirty thousand, four hundred twenty-five".