156661223 has 2 divisors, whose sum is σ = 156661224. Its totient is φ = 156661222.

The previous prime is 156661207. The next prime is 156661229. The reversal of 156661223 is 322166651.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 156661223 - 2⁴ = 156661207 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 156661223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156661229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78330611 + 78330612.

It is an arithmetic number, because the mean of its divisors is an integer number (78330612).

Almost surely, 2^156661223 is an apocalyptic number.

156661223 is a deficient number, since it is larger than the sum of its proper divisors (1).

156661223 is an equidigital number, since it uses as much as digits as its factorization.

156661223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 32.

The square root of 156661223 is about 12516.4381115396. The cubic root of 156661223 is about 539.0807669111.

The spelling of 156661223 in words is "one hundred fifty-six million, six hundred sixty-one thousand, two hundred twenty-three".