1218256740672 has 168 divisors, whose sum is σ = 3516611919264. Its totient is φ = 371867885568.

The previous prime is 1218256740643. The next prime is 1218256740769. The reversal of 1218256740672 is 2760476528121.

It is a super-3 number, since 3×1218256740672³ (a number of 37 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1756363 + ... + 2349749.

Almost surely, 2^{1218256740672} is an apocalyptic number.

1218256740672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1218256740672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1758305959632).

1218256740672 is an abundant number, since it is smaller than the sum of its proper divisors (2298355178592).

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

1218256740672 is a wasteful number, since it uses less digits than its factorization.

1218256740672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593473 (or 593446 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 51.

The spelling of 1218256740672 in words is "one trillion, two hundred eighteen billion, two hundred fifty-six million, seven hundred forty thousand, six hundred seventy-two".