19494826826 has 4 divisors (see below), whose sum is σ = 29242240242. Its totient is φ = 9747413412.

The previous prime is 19494826817. The next prime is 19494826829. The reversal of 19494826826 is 62862849491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62862849491 = 13 ⋅4835603807.

It can be written as a sum of positive squares in only one way, i.e., 19418701201 + 76125625 = 139351^2 + 8725^2 .

It is not an unprimeable number, because it can be changed into a prime (19494826829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4873706705 + ... + 4873706708.

Almost surely, 2^19494826826 is an apocalyptic number.

19494826826 is a deficient number, since it is larger than the sum of its proper divisors (9747413416).

19494826826 is an equidigital number, since it uses as much as digits as its factorization.

19494826826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9747413415.

The product of its digits is 11943936, while the sum is 59.

The spelling of 19494826826 in words is "nineteen billion, four hundred ninety-four million, eight hundred twenty-six thousand, eight hundred twenty-six".