661327237 has 2 divisors, whose sum is σ = 661327238. Its totient is φ = 661327236.

The previous prime is 661327213. The next prime is 661327241. The reversal of 661327237 is 732723166.

661327237 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., 444619396 + 216707841 = 21086^2 + 14721^2 .

It is a cyclic number.

It is not a de Polignac number, because 661327237 - 2²⁷ = 527109509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661327196 and 661327205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661327207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330663618 + 330663619.

It is an arithmetic number, because the mean of its divisors is an integer number (330663619).

Almost surely, 2^661327237 is an apocalyptic number.

It is an amenable number.

661327237 is a deficient number, since it is larger than the sum of its proper divisors (1).

661327237 is an equidigital number, since it uses as much as digits as its factorization.

661327237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 37.

The square root of 661327237 is about 25716.2834989817. The cubic root of 661327237 is about 871.2419998209.

The spelling of 661327237 in words is "six hundred sixty-one million, three hundred twenty-seven thousand, two hundred thirty-seven".