217162670681 has 16 divisors (see below), whose sum is σ = 252953902080. Its totient is φ = 184445535120.

The previous prime is 217162670657. The next prime is 217162670687. The reversal of 217162670681 is 186076261712.

It is not a de Polignac number, because 217162670681 - 2¹⁰ = 217162669657 is a prime.

It is a super-2 number, since 2×217162670681² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (217162670687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9969941 + ... + 9991698.

It is an arithmetic number, because the mean of its divisors is an integer number (15809618880).

Almost surely, 2^217162670681 is an apocalyptic number.

It is an amenable number.

217162670681 is a deficient number, since it is larger than the sum of its proper divisors (35791231399).

217162670681 is a wasteful number, since it uses less digits than its factorization.

217162670681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19961716.

The product of its (nonzero) digits is 338688, while the sum is 47.

The spelling of 217162670681 in words is "two hundred seventeen billion, one hundred sixty-two million, six hundred seventy thousand, six hundred eighty-one".