305405663223656 has 16 divisors (see below), whose sum is σ = 575945651024100. Its totient is φ = 151820156283904.

The previous prime is 305405663223649. The next prime is 305405663223671. The reversal of 305405663223656 is 656322366504503.

It can be written as a sum of positive squares in 2 ways, for example, as 259861170444100 + 45544492779556 = 16120210^2 + 6748666^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110334414521 + ... + 110334417288.

Almost surely, 2^{305405663223656} is an apocalyptic number.

It is an amenable number.

305405663223656 is a deficient number, since it is larger than the sum of its proper divisors (270539987800444).

305405663223656 is a wasteful number, since it uses less digits than its factorization.

305405663223656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220668831988 (or 220668831984 counting only the distinct ones).

The product of its (nonzero) digits is 69984000, while the sum is 56.

The spelling of 305405663223656 in words is "three hundred five trillion, four hundred five billion, six hundred sixty-three million, two hundred twenty-three thousand, six hundred fifty-six".