1603336661 has 4 divisors (see below), whose sum is σ = 1603629024. Its totient is φ = 1603044300.

The previous prime is 1603336649. The next prime is 1603336667. The reversal of 1603336661 is 1666333061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1603336661 - 2²² = 1599142357 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 (1603336667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137795 + ... + 148976.

It is an arithmetic number, because the mean of its divisors is an integer number (400907256).

Almost surely, 2^1603336661 is an apocalyptic number.

It is an amenable number.

1603336661 is a deficient number, since it is larger than the sum of its proper divisors (292363).

1603336661 is an equidigital number, since it uses as much as digits as its factorization.

1603336661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292362.

The product of its (nonzero) digits is 34992, while the sum is 35.

The square root of 1603336661 is about 40041.6865404044. The cubic root of 1603336661 is about 1170.4195687615.

The spelling of 1603336661 in words is "one billion, six hundred three million, three hundred thirty-six thousand, six hundred sixty-one".