1664742004 has 6 divisors (see below), whose sum is σ = 2913298514. Its totient is φ = 832371000.

The previous prime is 1664741993. The next prime is 1664742007. The reversal of 1664742004 is 4002474661.

It can be written as a sum of positive squares in only one way, i.e., 1206867600 + 457874404 = 34740^2 + 21398^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664742007) 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 as a sum of consecutive naturals, namely, 208092747 + ... + 208092754.

Almost surely, 2^1664742004 is an apocalyptic number.

It is an amenable number.

1664742004 is a deficient number, since it is larger than the sum of its proper divisors (1248556510).

1664742004 is a wasteful number, since it uses less digits than its factorization.

1664742004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416185505 (or 416185503 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 1664742004 is about 40801.2500298704. The cubic root of 1664742004 is about 1185.1745377218.

The spelling of 1664742004 in words is "one billion, six hundred sixty-four million, seven hundred forty-two thousand, four".