1664013625 has 8 divisors (see below), whose sum is σ = 2076689160. Its totient is φ = 1331210800.

The previous prime is 1664013623. The next prime is 1664013643. The reversal of 1664013625 is 5263104661.

It can be written as a sum of positive squares in 4 ways, for example, as 313892089 + 1350121536 = 17717^2 + 36744^2 .

It is not a de Polignac number, because 1664013625 - 2¹ = 1664013623 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1664013623) 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 7 ways as a sum of consecutive naturals, for example, 6655930 + ... + 6656179.

It is an arithmetic number, because the mean of its divisors is an integer number (259586145).

Almost surely, 2^1664013625 is an apocalyptic number.

It is an amenable number.

1664013625 is a deficient number, since it is larger than the sum of its proper divisors (412675535).

1664013625 is an equidigital number, since it uses as much as digits as its factorization.

1664013625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13312124 (or 13312114 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 1664013625 is about 40792.3231135467. The cubic root of 1664013625 is about 1185.0016616497.

The spelling of 1664013625 in words is "one billion, six hundred sixty-four million, thirteen thousand, six hundred twenty-five".