661333 has 4 divisors (see below), whose sum is σ = 696160. Its totient is φ = 626508.

The previous prime is 661327. The next prime is 661343. The reversal of 661333 is 333166.

It is a happy number.

661333 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 661333 - 2¹⁷ = 530261 is a prime.

It is a super-2 number, since 2×661333² = 874722673778, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 661333.

It is not an unprimeable number, because it can be changed into a prime (661343) 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, 17385 + ... + 17422.

It is an arithmetic number, because the mean of its divisors is an integer number (174040).

2⁶⁶¹³³³ is an apocalyptic number.

It is an amenable number.

661333 is a deficient number, since it is larger than the sum of its proper divisors (34827).

661333 is a wasteful number, since it uses less digits than its factorization.

661333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34826.

The product of its digits is 972, while the sum is 22.

The square root of 661333 is about 813.2238314265. The cubic root of 661333 is about 87.1244530567.

Adding to 661333 its reverse (333166), we get a palindrome (994499).

It can be divided in two parts, 66 and 1333, that multiplied together give a palindrome (87978).

The spelling of 661333 in words is "six hundred sixty-one thousand, three hundred thirty-three".