243561142551 has 16 divisors (see below), whose sum is σ = 328977492480. Its totient is φ = 160263214080.

The previous prime is 243561142547. The next prime is 243561142579. The reversal of 243561142551 is 155241165342.

It is not a de Polignac number, because 243561142551 - 2² = 243561142547 is a prime.

It is a super-3 number, since 3×243561142551³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243561142541) 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 15 ways as a sum of consecutive naturals, for example, 212010 + ... + 729431.

It is an arithmetic number, because the mean of its divisors is an integer number (20561093280).

Almost surely, 2^243561142551 is an apocalyptic number.

243561142551 is a deficient number, since it is larger than the sum of its proper divisors (85416349929).

243561142551 is a wasteful number, since it uses less digits than its factorization.

243561142551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942566.

The product of its digits is 144000, while the sum is 39.

The spelling of 243561142551 in words is "two hundred forty-three billion, five hundred sixty-one million, one hundred forty-two thousand, five hundred fifty-one".