243886691064384 has 105 divisors (see below), whose sum is σ = 722959888223001. Its totient is φ = 81295188883200.

The previous prime is 243886691064293. The next prime is 243886691064389. The reversal of 243886691064384 is 483460196688342.

The square root of 243886691064384 is 15616872.

It is a perfect power (a square), and thus also a powerful number.

243886691064384 is a `hidden beast` number, since 2 + 4 + 3 + 8 + 86 + 6 + 9 + 106 + 438 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 240855749342784 + 3030941721600 = 15519528^2 + 1740960^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (243886691064389) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1124306334 + ... + 1124523234.

Almost surely, 2^{243886691064384} is an apocalyptic number.

243886691064384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

243886691064384 is the 15616872-nd square number.

It is an amenable number.

243886691064384 is an abundant number, since it is smaller than the sum of its proper divisors (479073197158617).

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

243886691064384 is an frugal number, since it uses more digits than its factorization.

243886691064384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433826 (or 216906 counting only the distinct ones).

The product of its (nonzero) digits is 1146617856, while the sum is 72.

The spelling of 243886691064384 in words is "two hundred forty-three trillion, eight hundred eighty-six billion, six hundred ninety-one million, sixty-four thousand, three hundred eighty-four".