1604665723 has 2 divisors, whose sum is σ = 1604665724. Its totient is φ = 1604665722.

The previous prime is 1604665721. The next prime is 1604665747. The reversal of 1604665723 is 3275664061.

It is a weak prime.

It is an emirp because it is prime and its reverse (3275664061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1604665723 - 2¹ = 1604665721 is a prime.

It is a super-2 number, since 2×1604665723² = 5149904165142225458, which contains 22 as substring.

Together with 1604665721, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1604665721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802332861 + 802332862.

It is an arithmetic number, because the mean of its divisors is an integer number (802332862).

Almost surely, 2^1604665723 is an apocalyptic number.

1604665723 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604665723 is an equidigital number, since it uses as much as digits as its factorization.

1604665723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 1604665723 is about 40058.2790818577. The cubic root of 1604665723 is about 1170.7428800554.

The spelling of 1604665723 in words is "one billion, six hundred four million, six hundred sixty-five thousand, seven hundred twenty-three".