243250255521 has 96 divisors (see below), whose sum is σ = 456110753280. Its totient is φ = 126984195072.

The previous prime is 243250255499. The next prime is 243250255553. The reversal of 243250255521 is 125552052342.

243250255521 is a `hidden beast` number, since 2 + 4 + 32 + 50 + 2 + 55 + 521 = 666.

It is not a de Polignac number, because 243250255521 - 2¹⁴ = 243250239137 is a prime.

It is a super-2 number, since 2×243250255521² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (243250255021) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 1595400 + ... + 1741206.

It is an arithmetic number, because the mean of its divisors is an integer number (4751153680).

Almost surely, 2^243250255521 is an apocalyptic number.

243250255521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

243250255521 is a deficient number, since it is larger than the sum of its proper divisors (212860497759).

243250255521 is a wasteful number, since it uses less digits than its factorization.

243250255521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145940 (or 145927 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 36.

The spelling of 243250255521 in words is "two hundred forty-three billion, two hundred fifty million, two hundred fifty-five thousand, five hundred twenty-one".