217369640052 has 18 divisors (see below), whose sum is σ = 549462145778. Its totient is φ = 72456546672.

The previous prime is 217369640023. The next prime is 217369640053. The reversal of 217369640052 is 250046963712.

It can be written as a sum of positive squares in only one way, i.e., 188151207696 + 29218432356 = 433764^2 + 170934^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217369640053) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3019022743 + ... + 3019022814.

Almost surely, 2^217369640052 is an apocalyptic number.

It is an amenable number.

217369640052 is an abundant number, since it is smaller than the sum of its proper divisors (332092505726).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

217369640052 is a wasteful number, since it uses less digits than its factorization.

217369640052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6038045567 (or 6038045562 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 217369640052 in words is "two hundred seventeen billion, three hundred sixty-nine million, six hundred forty thousand, fifty-two".