4226521778 has 4 divisors (see below), whose sum is σ = 6339782670. Its totient is φ = 2113260888.

The previous prime is 4226521771. The next prime is 4226521781. The reversal of 4226521778 is 8771256224.

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

It can be written as a sum of positive squares in only one way, i.e., 4221490729 + 5031049 = 64973^2 + 2243^2 .

It is not an unprimeable number, because it can be changed into a prime (4226521771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056630443 + ... + 1056630446.

Almost surely, 2^4226521778 is an apocalyptic number.

4226521778 is a deficient number, since it is larger than the sum of its proper divisors (2113260892).

4226521778 is a wasteful number, since it uses less digits than its factorization.

4226521778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2113260891.

The product of its digits is 376320, while the sum is 44.

The square root of 4226521778 is about 65011.7049307277. The cubic root of 4226521778 is about 1616.8176333366.

The spelling of 4226521778 in words is "four billion, two hundred twenty-six million, five hundred twenty-one thousand, seven hundred seventy-eight".