4519779661 has 2 divisors, whose sum is σ = 4519779662. Its totient is φ = 4519779660.

The previous prime is 4519779637. The next prime is 4519779701. The reversal of 4519779661 is 1669779154.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4489804036 + 29975625 = 67006^2 + 5475^2 .

It is a cyclic number.

It is not a de Polignac number, because 4519779661 - 2⁵ = 4519779629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4519774661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2259889830 + 2259889831.

It is an arithmetic number, because the mean of its divisors is an integer number (2259889831).

Almost surely, 2^4519779661 is an apocalyptic number.

It is an amenable number.

4519779661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4519779661 is an equidigital number, since it uses as much as digits as its factorization.

4519779661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2857680, while the sum is 55.

The square root of 4519779661 is about 67229.3065634326. The cubic root of 4519779661 is about 1653.3790149490.

The spelling of 4519779661 in words is "four billion, five hundred nineteen million, seven hundred seventy-nine thousand, six hundred sixty-one".