243649537656 has 48 divisors (see below), whose sum is σ = 708572638440. Its totient is φ = 69614153280.

The previous prime is 243649537619. The next prime is 243649537673. The reversal of 243649537656 is 656735946342.

It is a self number, because there is not a number n which added to its sum of digits gives 243649537656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103591315 + ... + 103593666.

Almost surely, 2^243649537656 is an apocalyptic number.

It is an amenable number.

243649537656 is an abundant number, since it is smaller than the sum of its proper divisors (464923100784).

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

243649537656 is a wasteful number, since it uses less digits than its factorization.

243649537656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207185004 (or 207184993 counting only the distinct ones).

The product of its digits is 97977600, while the sum is 60.

The spelling of 243649537656 in words is "two hundred forty-three billion, six hundred forty-nine million, five hundred thirty-seven thousand, six hundred fifty-six".