2506623643 has 4 divisors (see below), whose sum is σ = 2508525360. Its totient is φ = 2504721928.

The previous prime is 2506623619. The next prime is 2506623649. The reversal of 2506623643 is 3463266052.

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

It is a cyclic number.

It is not a de Polignac number, because 2506623643 - 2⁹ = 2506623131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2506623649) 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, 948880 + ... + 951517.

It is an arithmetic number, because the mean of its divisors is an integer number (627131340).

Almost surely, 2^2506623643 is an apocalyptic number.

2506623643 is a deficient number, since it is larger than the sum of its proper divisors (1901717).

2506623643 is a wasteful number, since it uses less digits than its factorization.

2506623643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901716.

The product of its (nonzero) digits is 155520, while the sum is 37.

The square root of 2506623643 is about 50066.1926153767. The cubic root of 2506623643 is about 1358.4063735031.

Adding to 2506623643 its reverse (3463266052), we get a palindrome (5969889695).

The spelling of 2506623643 in words is "two billion, five hundred six million, six hundred twenty-three thousand, six hundred forty-three".