1218517938226 has 16 divisors (see below), whose sum is σ = 1943599188024. Its totient is φ = 570959171584.

The previous prime is 1218517938181. The next prime is 1218517938247. The reversal of 1218517938226 is 6228397158121.

It is a Cunningham number, because it is equal to 1103865²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 948674052001 + 269843886225 = 973999^2 + 519465^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76899295 + ... + 76915138.

Almost surely, 2^{1218517938226} is an apocalyptic number.

1218517938226 is a deficient number, since it is larger than the sum of its proper divisors (725081249798).

1218517938226 is a wasteful number, since it uses less digits than its factorization.

1218517938226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153814685.

The product of its digits is 2903040, while the sum is 55.

The spelling of 1218517938226 in words is "one trillion, two hundred eighteen billion, five hundred seventeen million, nine hundred thirty-eight thousand, two hundred twenty-six".