1218822870645 has 24 divisors (see below), whose sum is σ = 2180775547392. Its totient is φ = 629069868000.

The previous prime is 1218822870613. The next prime is 1218822870667. The reversal of 1218822870645 is 5460782288121.

It is not a de Polignac number, because 1218822870645 - 2⁵ = 1218822870613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1218822870591 and 1218822870600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 436852681 + ... + 436855470.

It is an arithmetic number, because the mean of its divisors is an integer number (90865647808).

Almost surely, 2^{1218822870645} is an apocalyptic number.

1218822870645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1218822870645 is a deficient number, since it is larger than the sum of its proper divisors (961952676747).

1218822870645 is a wasteful number, since it uses less digits than its factorization.

1218822870645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873708193 (or 873708190 counting only the distinct ones).

The product of its (nonzero) digits is 3440640, while the sum is 54.

The spelling of 1218822870645 in words is "one trillion, two hundred eighteen billion, eight hundred twenty-two million, eight hundred seventy thousand, six hundred forty-five".