1218663520 has 48 divisors (see below), whose sum is σ = 2978382960. Its totient is φ = 470654464.

The previous prime is 1218663499. The next prime is 1218663521. The reversal of 1218663520 is 253668121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218663521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126682 + ... + 135961.

It is an arithmetic number, because the mean of its divisors is an integer number (62049645).

Almost surely, 2^1218663520 is an apocalyptic number.

1218663520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218663520 is an abundant number, since it is smaller than the sum of its proper divisors (1759719440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1218663520 is a wasteful number, since it uses less digits than its factorization.

1218663520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262687 (or 262679 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 1218663520 is about 34909.3614951634. The cubic root of 1218663520 is about 1068.1394049022.

The spelling of 1218663520 in words is "one billion, two hundred eighteen million, six hundred sixty-three thousand, five hundred twenty".