1218840020642 has 16 divisors (see below), whose sum is σ = 1845083870520. Its totient is φ = 603812371968.

The previous prime is 1218840020599. The next prime is 1218840020711. The reversal of 1218840020642 is 2460200488121.

It can be written as a sum of positive squares in 4 ways, for example, as 1137381723361 + 81458297281 = 1066481^2 + 285409^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1218840020596 and 1218840020605.

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, 12739568 + ... + 12834884.

Almost surely, 2^{1218840020642} is an apocalyptic number.

1218840020642 is a deficient number, since it is larger than the sum of its proper divisors (626243849878).

1218840020642 is a wasteful number, since it uses less digits than its factorization.

1218840020642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154085.

The product of its (nonzero) digits is 49152, while the sum is 38.

The spelling of 1218840020642 in words is "one trillion, two hundred eighteen billion, eight hundred forty million, twenty thousand, six hundred forty-two".