243772554640 has 80 divisors (see below), whose sum is σ = 592360055280. Its totient is φ = 93175971840.

The previous prime is 243772554631. The next prime is 243772554671. The reversal of 243772554640 is 46455277342.

It can be written as a sum of positive squares in 8 ways, for example, as 8543674624 + 235228880016 = 92432^2 + 485004^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 316581 + ... + 766660.

It is an arithmetic number, because the mean of its divisors is an integer number (7404500691).

Almost surely, 2^243772554640 is an apocalyptic number.

243772554640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243772554640 is an abundant number, since it is smaller than the sum of its proper divisors (348587500640).

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

243772554640 is a wasteful number, since it uses less digits than its factorization.

243772554640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083380 (or 1083374 counting only the distinct ones).

The product of its (nonzero) digits is 5644800, while the sum is 49.

The spelling of 243772554640 in words is "two hundred forty-three billion, seven hundred seventy-two million, five hundred fifty-four thousand, six hundred forty".