243554475656 has 8 divisors (see below), whose sum is σ = 456664641870. Its totient is φ = 121777237824.

The previous prime is 243554475641. The next prime is 243554475677. The reversal of 243554475656 is 656574455342.

It can be written as a sum of positive squares in only one way, i.e., 207693478756 + 35860996900 = 455734^2 + 189370^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×243554475656² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15222154721 + ... + 15222154736.

Almost surely, 2^243554475656 is an apocalyptic number.

It is an amenable number.

243554475656 is a deficient number, since it is larger than the sum of its proper divisors (213110166214).

243554475656 is a wasteful number, since it uses less digits than its factorization.

243554475656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30444309463 (or 30444309459 counting only the distinct ones).

The product of its digits is 60480000, while the sum is 56.

The spelling of 243554475656 in words is "two hundred forty-three billion, five hundred fifty-four million, four hundred seventy-five thousand, six hundred fifty-six".