2505866413 has 4 divisors (see below), whose sum is σ = 2566985148. Its totient is φ = 2444747680.

The previous prime is 2505866359. The next prime is 2505866449. The reversal of 2505866413 is 3146685052.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 91814724 + 2414051689 = 9582^2 + 49133^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2505866413 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2505866513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30559306 + ... + 30559387.

It is an arithmetic number, because the mean of its divisors is an integer number (641746287).

Almost surely, 2^2505866413 is an apocalyptic number.

It is an amenable number.

2505866413 is a deficient number, since it is larger than the sum of its proper divisors (61118735).

2505866413 is an equidigital number, since it uses as much as digits as its factorization.

2505866413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61118734.

The product of its (nonzero) digits is 172800, while the sum is 40.

The square root of 2505866413 is about 50058.6297555177. The cubic root of 2505866413 is about 1358.2695719988.

The spelling of 2505866413 in words is "two billion, five hundred five million, eight hundred sixty-six thousand, four hundred thirteen".