1218217774000 has 80 divisors (see below), whose sum is σ = 2945889326016. Its totient is φ = 487247616000.

The previous prime is 1218217773923. The next prime is 1218217774013. The reversal of 1218217774000 is 4777128121.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 48481440 + ... + 48506560.

Almost surely, 2^{1218217774000} is an apocalyptic number.

1218217774000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218217774000 is an abundant number, since it is smaller than the sum of its proper divisors (1727671552016).

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

1218217774000 is a wasteful number, since it uses less digits than its factorization.

1218217774000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49391 (or 49375 counting only the distinct ones).

The product of its (nonzero) digits is 43904, while the sum is 40.

The spelling of 1218217774000 in words is "one trillion, two hundred eighteen billion, two hundred seventeen million, seven hundred seventy-four thousand".