661933361 has 2 divisors, whose sum is σ = 661933362. Its totient is φ = 661933360.

The previous prime is 661933291. The next prime is 661933379. The reversal of 661933361 is 163339166.

661933361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 622003600 + 39929761 = 24940^2 + 6319^2 .

It is a cyclic number.

It is not a de Polignac number, because 661933361 - 2²² = 657739057 is a prime.

It is not a weakly prime, because it can be changed into another prime (661935361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330966680 + 330966681.

It is an arithmetic number, because the mean of its divisors is an integer number (330966681).

Almost surely, 2^661933361 is an apocalyptic number.

It is an amenable number.

661933361 is a deficient number, since it is larger than the sum of its proper divisors (1).

661933361 is an equidigital number, since it uses as much as digits as its factorization.

661933361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52488, while the sum is 38.

The square root of 661933361 is about 25728.0656288031. The cubic root of 661933361 is about 871.5080906985.

The spelling of 661933361 in words is "six hundred sixty-one million, nine hundred thirty-three thousand, three hundred sixty-one".