661422384223 has 2 divisors, whose sum is σ = 661422384224. Its totient is φ = 661422384222.

The previous prime is 661422384179. The next prime is 661422384239. The reversal of 661422384223 is 322483224166.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661422384223 - 2⁹ = 661422383711 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 661422384223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661422384263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330711192111 + 330711192112.

It is an arithmetic number, because the mean of its divisors is an integer number (330711192112).

Almost surely, 2^661422384223 is an apocalyptic number.

661422384223 is a deficient number, since it is larger than the sum of its proper divisors (1).

661422384223 is an equidigital number, since it uses as much as digits as its factorization.

661422384223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 663552, while the sum is 43.

The spelling of 661422384223 in words is "six hundred sixty-one billion, four hundred twenty-two million, three hundred eighty-four thousand, two hundred twenty-three".