1218309764856 has 64 divisors (see below), whose sum is σ = 3082110638880. Its totient is φ = 401287011840.

The previous prime is 1218309764831. The next prime is 1218309764869. The reversal of 1218309764856 is 6584679038121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1218309764856.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211171 + ... + 1575186.

It is a 1-persistent number, because it is pandigital, but 2⋅1218309764856 = 2436619529712 is not.

Almost surely, 2^{1218309764856} is an apocalyptic number.

It is an amenable number.

1218309764856 is an abundant number, since it is smaller than the sum of its proper divisors (1863800874024).

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

1218309764856 is a wasteful number, since it uses less digits than its factorization.

1218309764856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1786704 (or 1786700 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 60.

The spelling of 1218309764856 in words is "one trillion, two hundred eighteen billion, three hundred nine million, seven hundred sixty-four thousand, eight hundred fifty-six".