1218379039641 has 12 divisors (see below), whose sum is σ = 1863403237332. Its totient is φ = 764473122816.

The previous prime is 1218379039639. The next prime is 1218379039649. The reversal of 1218379039641 is 1469309738121.

1218379039641 is a `hidden beast` number, since 1 + 2 + 183 + 79 + 0 + 396 + 4 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1063587940416 + 154791099225 = 1031304^2 + 393435^2 .

It is not a de Polignac number, because 1218379039641 - 2¹ = 1218379039639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1218379039649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3981630696 + ... + 3981631001.

It is an arithmetic number, because the mean of its divisors is an integer number (155283603111).

Almost surely, 2^{1218379039641} is an apocalyptic number.

It is an amenable number.

1218379039641 is a deficient number, since it is larger than the sum of its proper divisors (645024197691).

1218379039641 is a wasteful number, since it uses less digits than its factorization.

1218379039641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7963261720 (or 7963261717 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The spelling of 1218379039641 in words is "one trillion, two hundred eighteen billion, three hundred seventy-nine million, thirty-nine thousand, six hundred forty-one".