2425643621 has 4 divisors (see below), whose sum is σ = 2431574700. Its totient is φ = 2419712544.

The previous prime is 2425643581. The next prime is 2425643629. The reversal of 2425643621 is 1263465242.

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 2360599396 + 65044225 = 48586^2 + 8065^2 .

It is a cyclic number.

It is not a de Polignac number, because 2425643621 - 2⁶ = 2425643557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2425643629) 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, 2964926 + ... + 2965743.

It is an arithmetic number, because the mean of its divisors is an integer number (607893675).

Almost surely, 2^2425643621 is an apocalyptic number.

It is an amenable number.

2425643621 is a deficient number, since it is larger than the sum of its proper divisors (5931079).

2425643621 is an equidigital number, since it uses as much as digits as its factorization.

2425643621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5931078.

The product of its digits is 69120, while the sum is 35.

The square root of 2425643621 is about 49250.8235565660. The cubic root of 2425643621 is about 1343.6175401980.

The spelling of 2425643621 in words is "two billion, four hundred twenty-five million, six hundred forty-three thousand, six hundred twenty-one".