243640535556 has 48 divisors (see below), whose sum is σ = 623980723968. Its totient is φ = 73377511200.

The previous prime is 243640535513. The next prime is 243640535597. The reversal of 243640535556 is 655535046342.

It is a happy number.

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, 5640330 + ... + 5683361.

It is an arithmetic number, because the mean of its divisors is an integer number (12999598416).

Almost surely, 2^243640535556 is an apocalyptic number.

It is an amenable number.

243640535556 is an abundant number, since it is smaller than the sum of its proper divisors (380340188412).

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

243640535556 is a wasteful number, since it uses less digits than its factorization.

243640535556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11323872 (or 11323870 counting only the distinct ones).

The product of its (nonzero) digits is 6480000, while the sum is 48.

The spelling of 243640535556 in words is "two hundred forty-three billion, six hundred forty million, five hundred thirty-five thousand, five hundred fifty-six".