661199333 has 16 divisors (see below), whose sum is σ = 707616000. Its totient is φ = 616667520.

The previous prime is 661199317. The next prime is 661199339. The reversal of 661199333 is 333991166.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 661199333 - 2⁴ = 661199317 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661199339) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119768 + ... + 125166.

It is an arithmetic number, because the mean of its divisors is an integer number (44226000).

Almost surely, 2^661199333 is an apocalyptic number.

It is an amenable number.

661199333 is a deficient number, since it is larger than the sum of its proper divisors (46416667).

661199333 is a wasteful number, since it uses less digits than its factorization.

661199333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5572.

The product of its digits is 78732, while the sum is 41.

The square root of 661199333 is about 25713.7965497124. The cubic root of 661199333 is about 871.1858286773.

The spelling of 661199333 in words is "six hundred sixty-one million, one hundred ninety-nine thousand, three hundred thirty-three".