217456745644 has 12 divisors (see below), whose sum is σ = 400578215800. Its totient is φ = 103005826848.

The previous prime is 217456745609. The next prime is 217456745651. The reversal of 217456745644 is 446547654712.

217456745644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1430636409 + ... + 1430636560.

Almost surely, 2^217456745644 is an apocalyptic number.

It is an amenable number.

217456745644 is a deficient number, since it is larger than the sum of its proper divisors (183121470156).

217456745644 is a wasteful number, since it uses less digits than its factorization.

217456745644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2861272992 (or 2861272990 counting only the distinct ones).

The product of its digits is 22579200, while the sum is 55.

The spelling of 217456745644 in words is "two hundred seventeen billion, four hundred fifty-six million, seven hundred forty-five thousand, six hundred forty-four".