2156603305 has 16 divisors (see below), whose sum is σ = 2619279504. Its totient is φ = 1704478720.

The previous prime is 2156603287. The next prime is 2156603311. The reversal of 2156603305 is 5033066512.

It can be written as a sum of positive squares in 8 ways, for example, as 692163481 + 1464439824 = 26309^2 + 38268^2 .

It is not a de Polignac number, because 2156603305 - 2⁷ = 2156603177 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173085 + ... + 185125.

It is an arithmetic number, because the mean of its divisors is an integer number (163704969).

Almost surely, 2^2156603305 is an apocalyptic number.

It is an amenable number.

2156603305 is a deficient number, since it is larger than the sum of its proper divisors (462676199).

2156603305 is a wasteful number, since it uses less digits than its factorization.

2156603305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12476.

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 2156603305 is about 46439.2431570541. The cubic root of 2156603305 is about 1291.9828698681.

Adding to 2156603305 its reverse (5033066512), we get a palindrome (7189669817).

The spelling of 2156603305 in words is "two billion, one hundred fifty-six million, six hundred three thousand, three hundred five".