663537 has 16 divisors (see below), whose sum is σ = 1064960. Its totient is φ = 358992.

The previous prime is 663529. The next prime is 663539. The reversal of 663537 is 735366.

It is not a de Polignac number, because 663537 - 2³ = 663529 is a prime.

It is a Duffinian number.

It is a zygodrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (663539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 433 + ... + 1230.

It is an arithmetic number, because the mean of its divisors is an integer number (66560).

2⁶⁶³⁵³⁷ is an apocalyptic number.

It is an amenable number.

663537 is a deficient number, since it is larger than the sum of its proper divisors (401423).

663537 is a wasteful number, since it uses less digits than its factorization.

663537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1692.

The product of its digits is 11340, while the sum is 30.

The square root of 663537 is about 814.5778047553. The cubic root of 663537 is about 87.2211312170.

The spelling of 663537 in words is "six hundred sixty-three thousand, five hundred thirty-seven".