1218181940674 has 4 divisors (see below), whose sum is σ = 1827272911014. Its totient is φ = 609090970336.

The previous prime is 1218181940659. The next prime is 1218181940681. The reversal of 1218181940674 is 4760491818121.

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., 1122148269225 + 96033671449 = 1059315^2 + 309893^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304545485167 + ... + 304545485170.

Almost surely, 2^{1218181940674} is an apocalyptic number.

1218181940674 is a deficient number, since it is larger than the sum of its proper divisors (609090970340).

1218181940674 is an equidigital number, since it uses as much as digits as its factorization.

1218181940674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609090970339.

The product of its (nonzero) digits is 774144, while the sum is 52.

The spelling of 1218181940674 in words is "one trillion, two hundred eighteen billion, one hundred eighty-one million, nine hundred forty thousand, six hundred seventy-four".