663461 has 4 divisors (see below), whose sum is σ = 698400. Its totient is φ = 628524.

The previous prime is 663437. The next prime is 663463. The reversal of 663461 is 164366.

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, and also an emirpimes, since its reverse is a distinct semiprime: 164366 = 2 ⋅82183.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663461 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 663461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17441 + ... + 17478.

It is an arithmetic number, because the mean of its divisors is an integer number (174600).

2⁶⁶³⁴⁶¹ is an apocalyptic number.

It is an amenable number.

663461 is a deficient number, since it is larger than the sum of its proper divisors (34939).

663461 is a wasteful number, since it uses less digits than its factorization.

663461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34938.

The product of its digits is 2592, while the sum is 26.

The square root of 663461 is about 814.5311534865. The cubic root of 663461 is about 87.2178010540.

The spelling of 663461 in words is "six hundred sixty-three thousand, four hundred sixty-one".