657563449 has 3 divisors (see below), whose sum is σ = 657589093. Its totient is φ = 657537806.

The previous prime is 657563411. The next prime is 657563477. The reversal of 657563449 is 944365756.

It is a happy number.

The square root of 657563449 is 25643.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 657563449 - 2⁹ = 657562937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (657563479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 12822 + ... + 38464.

Almost surely, 2^657563449 is an apocalyptic number.

657563449 is the 25643-rd square number.

657563449 is the 12822-nd centered octagonal number.

It is an amenable number.

657563449 is a deficient number, since it is larger than the sum of its proper divisors (25644).

657563449 is an frugal number, since it uses more digits than its factorization.

657563449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51286 (or 25643 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 49.

The cubic root of 657563449 is about 869.5860315302.

Multiplying 657563449 by its sum of digits (49), we get a square (32220609001 = 179501²).

The spelling of 657563449 in words is "six hundred fifty-seven million, five hundred sixty-three thousand, four hundred forty-nine".