2644402251 has 4 divisors (see below), whose sum is σ = 3525869672. Its totient is φ = 1762934832.

The previous prime is 2644402249. The next prime is 2644402307. The reversal of 2644402251 is 1522044462.

2644402251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 2644402251 - 2¹ = 2644402249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2644402231) 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, 440733706 + ... + 440733711.

It is an arithmetic number, because the mean of its divisors is an integer number (881467418).

Almost surely, 2^2644402251 is an apocalyptic number.

2644402251 is a deficient number, since it is larger than the sum of its proper divisors (881467421).

2644402251 is an equidigital number, since it uses as much as digits as its factorization.

2644402251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881467420.

The product of its (nonzero) digits is 15360, while the sum is 30.

The square root of 2644402251 is about 51423.7518176183. The cubic root of 2644402251 is about 1382.8524370070.

The spelling of 2644402251 in words is "two billion, six hundred forty-four million, four hundred two thousand, two hundred fifty-one".