2421661779 has 10 divisors (see below), whose sum is σ = 3617544260. Its totient is φ = 1614441132.

The previous prime is 2421661769. The next prime is 2421661799. The reversal of 2421661779 is 9771661242.

2421661779 is a `hidden beast` number, since 2 + 4 + 21 + 6 + 617 + 7 + 9 = 666.

It is not a de Polignac number, because 2421661779 - 2²⁰ = 2420613203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2421661709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 14948449 + ... + 14948610.

It is an arithmetic number, because the mean of its divisors is an integer number (361754426).

Almost surely, 2^2421661779 is an apocalyptic number.

2421661779 is a deficient number, since it is larger than the sum of its proper divisors (1195882481).

2421661779 is an equidigital number, since it uses as much as digits as its factorization.

2421661779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29897071 (or 29897062 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 2421661779 is about 49210.3828373647. The cubic root of 2421661779 is about 1342.8819274764.

The spelling of 2421661779 in words is "two billion, four hundred twenty-one million, six hundred sixty-one thousand, seven hundred seventy-nine".