661272323 has 2 divisors, whose sum is σ = 661272324. Its totient is φ = 661272322.

The previous prime is 661272319. The next prime is 661272331. The reversal of 661272323 is 323272166.

661272323 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661272323 - 2² = 661272319 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 661272323.

It is not a weakly prime, because it can be changed into another prime (661272343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330636161 + 330636162.

It is an arithmetic number, because the mean of its divisors is an integer number (330636162).

Almost surely, 2^661272323 is an apocalyptic number.

661272323 is a deficient number, since it is larger than the sum of its proper divisors (1).

661272323 is an equidigital number, since it uses as much as digits as its factorization.

661272323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 32.

The square root of 661272323 is about 25715.2157875449. The cubic root of 661272323 is about 871.2178843226.

The spelling of 661272323 in words is "six hundred sixty-one million, two hundred seventy-two thousand, three hundred twenty-three".