657242005243 has 4 divisors (see below), whose sum is σ = 675005302720. Its totient is φ = 639478707768.

The previous prime is 657242005223. The next prime is 657242005249. The reversal of 657242005243 is 342500242756.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-657242005243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 657242005196 and 657242005205.

It is not an unprimeable number, because it can be changed into a prime (657242005249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8881648683 + ... + 8881648756.

It is an arithmetic number, because the mean of its divisors is an integer number (168751325680).

Almost surely, 2^657242005243 is an apocalyptic number.

657242005243 is a deficient number, since it is larger than the sum of its proper divisors (17763297477).

657242005243 is a wasteful number, since it uses less digits than its factorization.

657242005243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17763297476.

The product of its (nonzero) digits is 403200, while the sum is 40.

Adding to 657242005243 its reverse (342500242756), we get a palindrome (999742247999).

The spelling of 657242005243 in words is "six hundred fifty-seven billion, two hundred forty-two million, five thousand, two hundred forty-three".