1243899916560 has 1280 divisors, whose sum is σ = 5174068838400. Its totient is φ = 268738560000.

The previous prime is 1243899916543. The next prime is 1243899916583. The reversal of 1243899916560 is 656199983421.

1243899916560 is a `hidden beast` number, since 1 + 2 + 4 + 389 + 99 + 165 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 4955776435 + ... + 4955776685.

It is an arithmetic number, because the mean of its divisors is an integer number (4042241280).

Almost surely, 2^{1243899916560} is an apocalyptic number.

1243899916560 is a gapful number since it is divisible by the number (10) 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 1243899916560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2587034419200).

1243899916560 is an abundant number, since it is smaller than the sum of its proper divisors (3930168921840).

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

1243899916560 is a wasteful number, since it uses less digits than its factorization.

1243899916560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517 (or 505 counting only the distinct ones).

The product of its (nonzero) digits is 25194240, while the sum is 63.

The spelling of 1243899916560 in words is "one trillion, two hundred forty-three billion, eight hundred ninety-nine million, nine hundred sixteen thousand, five hundred sixty".