243725779538 has 8 divisors (see below), whose sum is σ = 365592910320. Its totient is φ = 121861476100.

The previous prime is 243725779523. The next prime is 243725779573. The reversal of 243725779538 is 835977527342.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×243725779538² (a number of 24 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 476288 + ... + 845163.

It is an arithmetic number, because the mean of its divisors is an integer number (45699113790).

Almost surely, 2^243725779538 is an apocalyptic number.

243725779538 is a deficient number, since it is larger than the sum of its proper divisors (121867130782).

243725779538 is a wasteful number, since it uses less digits than its factorization.

243725779538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1413672.

The product of its digits is 88905600, while the sum is 62.

The spelling of 243725779538 in words is "two hundred forty-three billion, seven hundred twenty-five million, seven hundred seventy-nine thousand, five hundred thirty-eight".