661541333 has 8 divisors (see below), whose sum is σ = 685896960. Its totient is φ = 637374240.

The previous prime is 661541269. The next prime is 661541357. The reversal of 661541333 is 333145166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661541333 - 2⁶ = 661541269 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 661541333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661541393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39968 + ... + 54041.

It is an arithmetic number, because the mean of its divisors is an integer number (85737120).

Almost surely, 2^661541333 is an apocalyptic number.

It is an amenable number.

661541333 is a deficient number, since it is larger than the sum of its proper divisors (24355627).

661541333 is a wasteful number, since it uses less digits than its factorization.

661541333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94267.

The product of its digits is 19440, while the sum is 32.

The square root of 661541333 is about 25720.4458165095. The cubic root of 661541333 is about 871.3360073921.

Adding to 661541333 its reverse (333145166), we get a palindrome (994686499).

The spelling of 661541333 in words is "six hundred sixty-one million, five hundred forty-one thousand, three hundred thirty-three".