663513257 has 4 divisors (see below), whose sum is σ = 723832656. Its totient is φ = 603193860.

The previous prime is 663513251. The next prime is 663513289. The reversal of 663513257 is 752315366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 663513257 - 2²⁸ = 395077801 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 663513257.

It is not an unprimeable number, because it can be changed into a prime (663513251) 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, 30159683 + ... + 30159704.

It is an arithmetic number, because the mean of its divisors is an integer number (180958164).

Almost surely, 2^663513257 is an apocalyptic number.

It is an amenable number.

663513257 is a deficient number, since it is larger than the sum of its proper divisors (60319399).

663513257 is a wasteful number, since it uses less digits than its factorization.

663513257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60319398.

The product of its digits is 113400, while the sum is 38.

The square root of 663513257 is about 25758.7510760906. The cubic root of 663513257 is about 872.2009087508.

The spelling of 663513257 in words is "six hundred sixty-three million, five hundred thirteen thousand, two hundred fifty-seven".