18809785850626 has 16 divisors (see below), whose sum is σ = 29515549289400. Its totient is φ = 8978557211008.

The previous prime is 18809785850623. The next prime is 18809785850627. The reversal of 18809785850626 is 62605858790881.

It is a Cunningham number, because it is equal to 4337025²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 17087483957401 + 1722301893225 = 4133701^2 + 1312365^2 .

It is not an unprimeable number, because it can be changed into a prime (18809785850623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1821942325 + ... + 1821952648.

Almost surely, 2^{18809785850626} is an apocalyptic number.

18809785850626 is a deficient number, since it is larger than the sum of its proper divisors (10705763438774).

18809785850626 is a wasteful number, since it uses less digits than its factorization.

18809785850626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3643895093.

The product of its (nonzero) digits is 464486400, while the sum is 73.

The spelling of 18809785850626 in words is "eighteen trillion, eight hundred nine billion, seven hundred eighty-five million, eight hundred fifty thousand, six hundred twenty-six".