657538849 has 8 divisors (see below), whose sum is σ = 719212320. Its totient is φ = 596181600.

The previous prime is 657538781. The next prime is 657538859. The reversal of 657538849 is 948835756.

657538849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-657538849 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 657538849.

It is not an unprimeable number, because it can be changed into a prime (657538859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74692 + ... + 83029.

It is an arithmetic number, because the mean of its divisors is an integer number (89901540).

Almost surely, 2^657538849 is an apocalyptic number.

It is an amenable number.

657538849 is a deficient number, since it is larger than the sum of its proper divisors (61673471).

657538849 is a wasteful number, since it uses less digits than its factorization.

657538849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158111.

The product of its digits is 7257600, while the sum is 55.

The square root of 657538849 is about 25642.5203324478. The cubic root of 657538849 is about 869.5751874141.

The spelling of 657538849 in words is "six hundred fifty-seven million, five hundred thirty-eight thousand, eight hundred forty-nine".