4156221779 has 2 divisors, whose sum is σ = 4156221780. Its totient is φ = 4156221778.

The previous prime is 4156221571. The next prime is 4156221781. The reversal of 4156221779 is 9771226514.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4156221779 - 2²⁰ = 4155173203 is a prime.

Together with 4156221781, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4156221799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2078110889 + 2078110890.

It is an arithmetic number, because the mean of its divisors is an integer number (2078110890).

Almost surely, 2^4156221779 is an apocalyptic number.

4156221779 is a deficient number, since it is larger than the sum of its proper divisors (1).

4156221779 is an equidigital number, since it uses as much as digits as its factorization.

4156221779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 44.

The square root of 4156221779 is about 64468.7659180785. The cubic root of 4156221779 is about 1607.8032588257.

The spelling of 4156221779 in words is "four billion, one hundred fifty-six million, two hundred twenty-one thousand, seven hundred seventy-nine".