243522645551 has 16 divisors (see below), whose sum is σ = 265066208064. Its totient is φ = 222792850944.

The previous prime is 243522645481. The next prime is 243522645557. The reversal of 243522645551 is 155546225342.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 243522645551 - 2¹⁰ = 243522644527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243522645557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 486521 + ... + 850733.

It is an arithmetic number, because the mean of its divisors is an integer number (16566638004).

Almost surely, 2^243522645551 is an apocalyptic number.

243522645551 is a deficient number, since it is larger than the sum of its proper divisors (21543562513).

243522645551 is a wasteful number, since it uses less digits than its factorization.

243522645551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365330.

The product of its digits is 1440000, while the sum is 44.

The spelling of 243522645551 in words is "two hundred forty-three billion, five hundred twenty-two million, six hundred forty-five thousand, five hundred fifty-one".