1218622717441 has 4 divisors (see below), whose sum is σ = 1218627852372. Its totient is φ = 1218617582512.

The previous prime is 1218622717439. The next prime is 1218622717483. The reversal of 1218622717441 is 1447172268121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 554919215041 + 663703502400 = 744929^2 + 814680^2 .

It is a cyclic number.

It is not a de Polignac number, because 1218622717441 - 2¹ = 1218622717439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1218622717391 and 1218622717400.

It is not an unprimeable number, because it can be changed into a prime (1218622711441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2193310 + ... + 2692183.

It is an arithmetic number, because the mean of its divisors is an integer number (304656963093).

Almost surely, 2^{1218622717441} is an apocalyptic number.

It is an amenable number.

1218622717441 is a deficient number, since it is larger than the sum of its proper divisors (5134931).

1218622717441 is an equidigital number, since it uses as much as digits as its factorization.

1218622717441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5134930.

The product of its digits is 301056, while the sum is 46.

The spelling of 1218622717441 in words is "one trillion, two hundred eighteen billion, six hundred twenty-two million, seven hundred seventeen thousand, four hundred forty-one".