657017242009 has 4 divisors (see below), whose sum is σ = 674774464804. Its totient is φ = 639260019216.

The previous prime is 657017242001. The next prime is 657017242027. The reversal of 657017242009 is 900242710756.

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 530352432009 + 126664810000 = 728253^2 + 355900^2 .

It is a cyclic number.

It is not a de Polignac number, because 657017242009 - 2³ = 657017242001 is a prime.

It is a super-2 number, since 2×657017242009² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (657017242001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8878611342 + ... + 8878611415.

It is an arithmetic number, because the mean of its divisors is an integer number (168693616201).

Almost surely, 2^657017242009 is an apocalyptic number.

It is an amenable number.

657017242009 is a deficient number, since it is larger than the sum of its proper divisors (17757222795).

657017242009 is a wasteful number, since it uses less digits than its factorization.

657017242009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17757222794.

The product of its (nonzero) digits is 211680, while the sum is 43.

The spelling of 657017242009 in words is "six hundred fifty-seven billion, seventeen million, two hundred forty-two thousand, nine".