1603105661 has 8 divisors (see below), whose sum is σ = 1736881344. Its totient is φ = 1473716160.

The previous prime is 1603105613. The next prime is 1603105709. The reversal of 1603105661 is 1665013061.

It is an interprime number because it is at equal distance from previous prime (1603105613) and next prime (1603105709).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1603105661 - 2¹⁴ = 1603089277 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 (1603105561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1095785 + ... + 1097246.

It is an arithmetic number, because the mean of its divisors is an integer number (217110168).

Almost surely, 2^1603105661 is an apocalyptic number.

It is an amenable number.

1603105661 is a deficient number, since it is larger than the sum of its proper divisors (133775683).

1603105661 is a wasteful number, since it uses less digits than its factorization.

1603105661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2193091.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 1603105661 is about 40038.8019426156. The cubic root of 1603105661 is about 1170.3633568396.

The spelling of 1603105661 in words is "one billion, six hundred three million, one hundred five thousand, six hundred sixty-one".