243500621645 has 8 divisors (see below), whose sum is σ = 292462346904. Its totient is φ = 194626096704.

The previous prime is 243500621599. The next prime is 243500621657. The reversal of 243500621645 is 546126005342.

It can be written as a sum of positive squares in 4 ways, for example, as 729594121 + 242771027524 = 27011^2 + 492718^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243500621645 - 2²⁶ = 243433512781 is a prime.

It is a super-3 number, since 3×243500621645³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243500621599 and 243500621608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21793934 + ... + 21805103.

It is an arithmetic number, because the mean of its divisors is an integer number (36557793363).

Almost surely, 2^243500621645 is an apocalyptic number.

It is an amenable number.

243500621645 is a deficient number, since it is larger than the sum of its proper divisors (48961725259).

243500621645 is a wasteful number, since it uses less digits than its factorization.

243500621645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43600159.

The product of its (nonzero) digits is 172800, while the sum is 38.

Adding to 243500621645 its reverse (546126005342), we get a palindrome (789626626987).

The spelling of 243500621645 in words is "two hundred forty-three billion, five hundred million, six hundred twenty-one thousand, six hundred forty-five".