1218555703268 has 12 divisors (see below), whose sum is σ = 2134893000492. Its totient is φ = 608586274560.

The previous prime is 1218555703259. The next prime is 1218555703271. The reversal of 1218555703268 is 8623075558121.

It can be written as a sum of positive squares in 2 ways, for example, as 274766769124 + 943788934144 = 524182^2 + 971488^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172890305 + ... + 172897352.

It is an arithmetic number, because the mean of its divisors is an integer number (177907750041).

Almost surely, 2^{1218555703268} is an apocalyptic number.

It is an amenable number.

1218555703268 is a deficient number, since it is larger than the sum of its proper divisors (916337297224).

1218555703268 is a wasteful number, since it uses less digits than its factorization.

1218555703268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345788542 (or 345788540 counting only the distinct ones).

The product of its (nonzero) digits is 4032000, while the sum is 53.

The spelling of 1218555703268 in words is "one trillion, two hundred eighteen billion, five hundred fifty-five million, seven hundred three thousand, two hundred sixty-eight".