243040405045 has 4 divisors (see below), whose sum is σ = 291648486060. Its totient is φ = 194432324032.

The previous prime is 243040404983. The next prime is 243040405063. The reversal of 243040405045 is 540504040342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 110398036644 + 132642368401 = 332262^2 + 364201^2 .

It is a cyclic number.

It is not a de Polignac number, because 243040405045 - 2⁷ = 243040404917 is a prime.

It is a super-2 number, since 2×243040405045² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 243040404998 and 243040405016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24304040500 + ... + 24304040509.

It is an arithmetic number, because the mean of its divisors is an integer number (72912121515).

Almost surely, 2^243040405045 is an apocalyptic number.

It is an amenable number.

243040405045 is a deficient number, since it is larger than the sum of its proper divisors (48608081015).

243040405045 is an equidigital number, since it uses as much as digits as its factorization.

243040405045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48608081014.

The product of its (nonzero) digits is 38400, while the sum is 31.

Adding to 243040405045 its reverse (540504040342), we get a palindrome (783544445387).

The spelling of 243040405045 in words is "two hundred forty-three billion, forty million, four hundred five thousand, forty-five".