1218822870644 has 24 divisors (see below), whose sum is σ = 2158684564680. Its totient is φ = 602067147264.

The previous prime is 1218822870613. The next prime is 1218822870667. The reversal of 1218822870644 is 4460782288121.

It can be written as a sum of positive squares in 4 ways, for example, as 87386454544 + 1131436416100 = 295612^2 + 1063690^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 979409 + ... + 1843064.

It is an arithmetic number, because the mean of its divisors is an integer number (89945190195).

Almost surely, 2^{1218822870644} is an apocalyptic number.

It is an amenable number.

1218822870644 is a deficient number, since it is larger than the sum of its proper divisors (939861694036).

1218822870644 is a wasteful number, since it uses less digits than its factorization.

1218822870644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2823779 (or 2823777 counting only the distinct ones).

The product of its (nonzero) digits is 2752512, while the sum is 53.

The spelling of 1218822870644 in words is "one trillion, two hundred eighteen billion, eight hundred twenty-two million, eight hundred seventy thousand, six hundred forty-four".