1243053665280 has 2816 divisors, whose sum is σ = 5823672422400. Its totient is φ = 244611809280.

The previous prime is 1243053665237. The next prime is 1243053665353. The reversal of 1243053665280 is 825663503421.

1243053665280 is a `hidden beast` number, since 1 + 2 + 4 + 3 + 0 + 5 + 366 + 5 + 280 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 12814986192 + ... + 12814986288.

Almost surely, 2^{1243053665280} is an apocalyptic number.

1243053665280 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 1243053665280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2911836211200).

1243053665280 is an abundant number, since it is smaller than the sum of its proper divisors (4580618757120).

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

1243053665280 is a wasteful number, since it uses less digits than its factorization.

1243053665280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 45.

The spelling of 1243053665280 in words is "one trillion, two hundred forty-three billion, fifty-three million, six hundred sixty-five thousand, two hundred eighty".