662561 has 4 divisors (see below), whose sum is σ = 691392. Its totient is φ = 633732.

The previous prime is 662551. The next prime is 662567. The reversal of 662561 is 165266.

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: 165266 = 2 ⋅82633.

It is a cyclic number.

It is not a de Polignac number, because 662561 - 2¹⁸ = 400417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 662561.

It is not an unprimeable number, because it can be changed into a prime (662567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14381 + ... + 14426.

It is an arithmetic number, because the mean of its divisors is an integer number (172848).

2⁶⁶²⁵⁶¹ is an apocalyptic number.

It is an amenable number.

662561 is a deficient number, since it is larger than the sum of its proper divisors (28831).

662561 is a wasteful number, since it uses less digits than its factorization.

662561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28830.

The product of its digits is 2160, while the sum is 26.

The square root of 662561 is about 813.9785009446. The cubic root of 662561 is about 87.1783455615.

The spelling of 662561 in words is "six hundred sixty-two thousand, five hundred sixty-one".