1218294664 has 72 divisors (see below), whose sum is σ = 2513529630. Its totient is φ = 551669760.

The previous prime is 1218294601. The next prime is 1218294677. The reversal of 1218294664 is 4664928121.

It can be written as a sum of positive squares in 9 ways, for example, as 2377764 + 1215916900 = 1542^2 + 34870^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1218294664.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 16688932 + ... + 16689004.

Almost surely, 2^1218294664 is an apocalyptic number.

It is an amenable number.

1218294664 is an abundant number, since it is smaller than the sum of its proper divisors (1295234966).

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

1218294664 is an equidigital number, since it uses as much as digits as its factorization.

1218294664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251 (or 133 counting only the distinct ones).

The product of its digits is 165888, while the sum is 43.

The square root of 1218294664 is about 34904.0780425440. The cubic root of 1218294664 is about 1068.0316285340.

The spelling of 1218294664 in words is "one billion, two hundred eighteen million, two hundred ninety-four thousand, six hundred sixty-four".