661206033 has 12 divisors (see below), whose sum is σ = 955485648. Its totient is φ = 440614680.

The previous prime is 661206019. The next prime is 661206043. The reversal of 661206033 is 330602166.

It is not a de Polignac number, because 661206033 - 2⁴ = 661206017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661205988 and 661206006.

It is not an unprimeable number, because it can be changed into a prime (661206043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8266 + ... + 37292.

It is an arithmetic number, because the mean of its divisors is an integer number (79623804).

Almost surely, 2^661206033 is an apocalyptic number.

It is an amenable number.

661206033 is a deficient number, since it is larger than the sum of its proper divisors (294279615).

661206033 is a wasteful number, since it uses less digits than its factorization.

661206033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31564 (or 31561 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 661206033 is about 25713.9268296384. The cubic root of 661206033 is about 871.1887712722.

Adding to 661206033 its reverse (330602166), we get a palindrome (991808199).

The spelling of 661206033 in words is "six hundred sixty-one million, two hundred six thousand, thirty-three".