662661 has 18 divisors (see below), whose sum is σ = 1003782. Its totient is φ = 437400.

The previous prime is 662657. The next prime is 662671. The reversal of 662661 is 166266.

It can be written as a sum of positive squares in only one way, i.e., 656100 + 6561 = 810^2 + 81^2 .

It is not a de Polignac number, because 662661 - 2² = 662657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (662671) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6511 + ... + 6611.

2⁶⁶²⁶⁶¹ is an apocalyptic number.

It is an amenable number.

662661 is a deficient number, since it is larger than the sum of its proper divisors (341121).

662661 is an frugal number, since it uses more digits than its factorization.

662661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 104 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 662661 is about 814.0399253108. The cubic root of 662661 is about 87.1827312688.

The spelling of 662661 in words is "six hundred sixty-two thousand, six hundred sixty-one".