243563281680 has 80 divisors (see below), whose sum is σ = 761973284160. Its totient is φ = 64354328064.

The previous prime is 243563281667. The next prime is 243563281697. The reversal of 243563281680 is 86182365342.

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 (48).

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, 4629102 + ... + 4681421.

It is an arithmetic number, because the mean of its divisors is an integer number (9524666052).

Almost surely, 2^243563281680 is an apocalyptic number.

243563281680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243563281680 is an abundant number, since it is smaller than the sum of its proper divisors (518410002480).

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

243563281680 is a wasteful number, since it uses less digits than its factorization.

243563281680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9310648 (or 9310642 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 48.

The spelling of 243563281680 in words is "two hundred forty-three billion, five hundred sixty-three million, two hundred eighty-one thousand, six hundred eighty".