1660344403 has 4 divisors (see below), whose sum is σ = 1661371560. Its totient is φ = 1659317248.

The previous prime is 1660344383. The next prime is 1660344451. The reversal of 1660344403 is 3044430661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3044430661 = 107 ⋅28452623.

It is a cyclic number.

It is not a de Polignac number, because 1660344403 - 2⁹ = 1660343891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1660344463) 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 3 ways as a sum of consecutive naturals, for example, 511150 + ... + 514387.

It is an arithmetic number, because the mean of its divisors is an integer number (415342890).

Almost surely, 2^1660344403 is an apocalyptic number.

1660344403 is a deficient number, since it is larger than the sum of its proper divisors (1027157).

1660344403 is a wasteful number, since it uses less digits than its factorization.

1660344403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027156.

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 1660344403 is about 40747.3238753173. The cubic root of 1660344403 is about 1184.1300273694.

The spelling of 1660344403 in words is "one billion, six hundred sixty million, three hundred forty-four thousand, four hundred three".