2009303661 has 16 divisors (see below), whose sum is σ = 2838456000. Its totient is φ = 1259943168.

The previous prime is 2009303651. The next prime is 2009303671. The reversal of 2009303661 is 1663039002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2009303651) and next prime (2009303671).

It is not a de Polignac number, because 2009303661 - 2¹⁴ = 2009287277 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2009303651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75055 + ... + 98243.

It is an arithmetic number, because the mean of its divisors is an integer number (177403500).

Almost surely, 2^2009303661 is an apocalyptic number.

It is an amenable number.

2009303661 is a deficient number, since it is larger than the sum of its proper divisors (829152339).

2009303661 is a wasteful number, since it uses less digits than its factorization.

2009303661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24908.

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 2009303661 is about 44825.2569540878. The cubic root of 2009303661 is about 1261.8716747448.

The spelling of 2009303661 in words is "two billion, nine million, three hundred three thousand, six hundred sixty-one".