663554 has 4 divisors (see below), whose sum is σ = 995334. Its totient is φ = 331776.

The previous prime is 663547. The next prime is 663557. The reversal of 663554 is 455366.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 332929 + 330625 = 577^2 + 575^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165887 + ... + 165890.

2⁶⁶³⁵⁵⁴ is an apocalyptic number.

663554 is a deficient number, since it is larger than the sum of its proper divisors (331780).

663554 is a wasteful number, since it uses less digits than its factorization.

663554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331779.

The product of its digits is 10800, while the sum is 29.

The square root of 663554 is about 814.5882395419. The cubic root of 663554 is about 87.2218760871.

The spelling of 663554 in words is "six hundred sixty-three thousand, five hundred fifty-four".