1661361303 has 16 divisors (see below), whose sum is σ = 2533144320. Its totient is φ = 948769536.

The previous prime is 1661361271. The next prime is 1661361307. The reversal of 1661361303 is 3031631661.

It is not a de Polignac number, because 1661361303 - 2⁵ = 1661361271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661361307) 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, 12328 + ... + 58946.

It is an arithmetic number, because the mean of its divisors is an integer number (158321520).

Almost surely, 2^1661361303 is an apocalyptic number.

1661361303 is a deficient number, since it is larger than the sum of its proper divisors (871783017).

1661361303 is a wasteful number, since it uses less digits than its factorization.

1661361303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48326.

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

The square root of 1661361303 is about 40759.8000853782. The cubic root of 1661361303 is about 1184.3717234246.

Adding to 1661361303 its reverse (3031631661), we get a palindrome (4692992964).

The spelling of 1661361303 in words is "one billion, six hundred sixty-one million, three hundred sixty-one thousand, three hundred three".