1218656263 has 8 divisors (see below), whose sum is σ = 1344381840. Its totient is φ = 1095420480.

The previous prime is 1218656251. The next prime is 1218656273. The reversal of 1218656263 is 3626568121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1218656263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218656273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 621420 + ... + 623377.

It is an arithmetic number, because the mean of its divisors is an integer number (168047730).

Almost surely, 2^1218656263 is an apocalyptic number.

1218656263 is a deficient number, since it is larger than the sum of its proper divisors (125725577).

1218656263 is a wasteful number, since it uses less digits than its factorization.

1218656263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244897.

The product of its digits is 103680, while the sum is 40.

The square root of 1218656263 is about 34909.2575544081. The cubic root of 1218656263 is about 1068.1372846826.

The spelling of 1218656263 in words is "one billion, two hundred eighteen million, six hundred fifty-six thousand, two hundred sixty-three".