217077719056 has 45 divisors (see below), whose sum is σ = 462342957853. Its totient is φ = 98662372160.

The previous prime is 217077719041. The next prime is 217077719069. The reversal of 217077719056 is 650917770712.

The square root of 217077719056 is 465916.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 28860573456 + 188217145600 = 169884^2 + 433840^2 .

It is a super-2 number, since 2×217077719056² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 217077718994 and 217077719012.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 20495010 + ... + 20505598.

Almost surely, 2^217077719056 is an apocalyptic number.

217077719056 is the 465916-th square number.

It is an amenable number.

217077719056 is an abundant number, since it is smaller than the sum of its proper divisors (245265238797).

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

217077719056 is an frugal number, since it uses more digits than its factorization.

217077719056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21208 (or 10602 counting only the distinct ones).

The product of its (nonzero) digits is 1296540, while the sum is 52.

The spelling of 217077719056 in words is "two hundred seventeen billion, seventy-seven million, seven hundred nineteen thousand, fifty-six".