2566161603 has 72 divisors (see below), whose sum is σ = 4111364400. Its totient is φ = 1536848640.

The previous prime is 2566161593. The next prime is 2566161607. The reversal of 2566161603 is 3061616652.

2566161603 is a `hidden beast` number, since 25 + 6 + 616 + 16 + 0 + 3 = 666.

It is not a de Polignac number, because 2566161603 - 2¹² = 2566157507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2566161607) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 23542713 + ... + 23542821.

Almost surely, 2^2566161603 is an apocalyptic number.

2566161603 is a deficient number, since it is larger than the sum of its proper divisors (1545202797).

2566161603 is a wasteful number, since it uses less digits than its factorization.

2566161603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293 (or 229 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 2566161603 is about 50657.2956542293. The cubic root of 2566161603 is about 1369.0773980814.

The spelling of 2566161603 in words is "two billion, five hundred sixty-six million, one hundred sixty-one thousand, six hundred three".