243117697536 has 720 divisors, whose sum is σ = 853710686400. Its totient is φ = 69132994560.

The previous prime is 243117697531. The next prime is 243117697553. The reversal of 243117697536 is 635796711342.

243117697536 is a `hidden beast` number, since 2 + 4 + 3 + 1 + 17 + 6 + 97 + 536 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (243117697531) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1152216471 + ... + 1152216681.

Almost surely, 2^243117697536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243117697536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (426855343200).

243117697536 is an abundant number, since it is smaller than the sum of its proper divisors (610592988864).

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

243117697536 is an frugal number, since it uses more digits than its factorization.

243117697536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274 (or 223 counting only the distinct ones).

The product of its digits is 5715360, while the sum is 54.

The spelling of 243117697536 in words is "two hundred forty-three billion, one hundred seventeen million, six hundred ninety-seven thousand, five hundred thirty-six".