217264745349 has 24 divisors (see below), whose sum is σ = 319237869600. Its totient is φ = 142347186720.

The previous prime is 217264745339. The next prime is 217264745389. The reversal of 217264745349 is 943547462712.

217264745349 is a `hidden beast` number, since 2 + 17 + 26 + 4 + 74 + 534 + 9 = 666.

It is not a de Polignac number, because 217264745349 - 2⁷ = 217264745221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 217264745295 and 217264745304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217264745309) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1844382 + ... + 1958640.

It is an arithmetic number, because the mean of its divisors is an integer number (13301577900).

Almost surely, 2^217264745349 is an apocalyptic number.

It is an amenable number.

217264745349 is a deficient number, since it is larger than the sum of its proper divisors (101973124251).

217264745349 is a wasteful number, since it uses less digits than its factorization.

217264745349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117905 (or 117902 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 54.

The spelling of 217264745349 in words is "two hundred seventeen billion, two hundred sixty-four million, seven hundred forty-five thousand, three hundred forty-nine".