217020766389 has 32 divisors (see below), whose sum is σ = 333286686720. Its totient is φ = 123044577600.

The previous prime is 217020766367. The next prime is 217020766393. The reversal of 217020766389 is 983667020712.

It is not a de Polignac number, because 217020766389 - 2⁸ = 217020766133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217020766399) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1490734 + ... + 1629824.

It is an arithmetic number, because the mean of its divisors is an integer number (10415208960).

Almost surely, 2^217020766389 is an apocalyptic number.

It is an amenable number.

217020766389 is a deficient number, since it is larger than the sum of its proper divisors (116265920331).

217020766389 is a wasteful number, since it uses less digits than its factorization.

217020766389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139681.

The product of its (nonzero) digits is 1524096, while the sum is 51.

The spelling of 217020766389 in words is "two hundred seventeen billion, twenty million, seven hundred sixty-six thousand, three hundred eighty-nine".