1664613 has 6 divisors (see below), whose sum is σ = 2404454. Its totient is φ = 1109736.

The previous prime is 1664569. The next prime is 1664627. The reversal of 1664613 is 3164661.

1664613 is a `hidden beast` number, since 1 + 6 + 646 + 13 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1633284 + 31329 = 1278^2 + 177^2 .

It is not a de Polignac number, because 1664613 - 2⁶ = 1664549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664633) 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 5 ways as a sum of consecutive naturals, for example, 92470 + ... + 92487.

2^1664613 is an apocalyptic number.

It is an amenable number.

1664613 is a deficient number, since it is larger than the sum of its proper divisors (739841).

1664613 is a wasteful number, since it uses less digits than its factorization.

1664613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184963 (or 184960 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 1664613 is about 1290.1988218875. The cubic root of 1664613 is about 118.5143923127.

It can be divided in two parts, 166461 and 3, that added together give a square (166464 = 408²).

The spelling of 1664613 in words is "one million, six hundred sixty-four thousand, six hundred thirteen".