243775563642 has 48 divisors (see below), whose sum is σ = 574441482888. Its totient is φ = 74265206400.

The previous prime is 243775563641. The next prime is 243775563671. The reversal of 243775563642 is 246365577342.

243775563642 is a `hidden beast` number, since 2 + 4 + 3 + 7 + 75 + 563 + 6 + 4 + 2 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 158610231081 + 85165332561 = 398259^2 + 291831^2 .

It is not an unprimeable number, because it can be changed into a prime (243775563641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5133673 + ... + 5180940.

Almost surely, 2^243775563642 is an apocalyptic number.

243775563642 is an abundant number, since it is smaller than the sum of its proper divisors (330665919246).

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

243775563642 is a wasteful number, since it uses less digits than its factorization.

243775563642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10314735 (or 10314732 counting only the distinct ones).

The product of its digits is 25401600, while the sum is 54.

The spelling of 243775563642 in words is "two hundred forty-three billion, seven hundred seventy-five million, five hundred sixty-three thousand, six hundred forty-two".