1243854135216 has 240 divisors, whose sum is σ = 4489685141760. Its totient is φ = 311938260480.

The previous prime is 1243854135193. The next prime is 1243854135221. The reversal of 1243854135216 is 6125314583421.

1243854135216 is a `hidden beast` number, since 1 + 2 + 4 + 3 + 85 + 41 + 3 + 521 + 6 = 666.

It is a super-2 number, since 2×1243854135216² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1612590 + ... + 2255693.

It is an arithmetic number, because the mean of its divisors is an integer number (18707021424).

Almost surely, 2^{1243854135216} is an apocalyptic number.

1243854135216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1243854135216 is an abundant number, since it is smaller than the sum of its proper divisors (3245831006544).

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

1243854135216 is a wasteful number, since it uses less digits than its factorization.

1243854135216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3868344 (or 3868335 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The spelling of 1243854135216 in words is "one trillion, two hundred forty-three billion, eight hundred fifty-four million, one hundred thirty-five thousand, two hundred sixteen".