661033 has 4 divisors (see below), whose sum is σ = 665028. Its totient is φ = 657040.

The previous prime is 661027. The next prime is 661049. The reversal of 661033 is 330166.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 330166 = 2 ⋅165083.

It can be written as a sum of positive squares in 2 ways, for example, as 597529 + 63504 = 773^2 + 252^2 .

It is a cyclic number.

It is not a de Polignac number, because 661033 - 2⁹ = 660521 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 661033.

It is not an unprimeable number, because it can be changed into a prime (661093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1738 + ... + 2083.

It is an arithmetic number, because the mean of its divisors is an integer number (166257).

2⁶⁶¹⁰³³ is an apocalyptic number.

It is an amenable number.

661033 is a deficient number, since it is larger than the sum of its proper divisors (3995).

661033 is a wasteful number, since it uses less digits than its factorization.

661033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3994.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 661033 is about 813.0393594409. The cubic root of 661033 is about 87.1112769970. Note that the first 3 decimals are identical.

Adding to 661033 its reverse (330166), we get a palindrome (991199).

It can be divided in two parts, 6610 and 33, that multiplied together give a triangular number (218130 = T₆₆₀).

The spelling of 661033 in words is "six hundred sixty-one thousand, thirty-three".