19776858226 has 4 divisors (see below), whose sum is σ = 29665287342. Its totient is φ = 9888429112.

The previous prime is 19776858169. The next prime is 19776858247. The reversal of 19776858226 is 62285867791.

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., 16269257601 + 3507600625 = 127551^2 + 59225^2 .

It is a super-2 number, since 2×19776858226² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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, 4944214555 + ... + 4944214558.

Almost surely, 2^19776858226 is an apocalyptic number.

19776858226 is a deficient number, since it is larger than the sum of its proper divisors (9888429116).

19776858226 is an equidigital number, since it uses as much as digits as its factorization.

19776858226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9888429115.

The product of its digits is 20321280, while the sum is 61.

The spelling of 19776858226 in words is "nineteen billion, seven hundred seventy-six million, eight hundred fifty-eight thousand, two hundred twenty-six".