890958666217 has 2 divisors, whose sum is σ = 890958666218. Its totient is φ = 890958666216.

The previous prime is 890958666197. The next prime is 890958666251. The reversal of 890958666217 is 712666859098.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 887780412841 + 3178253376 = 942221^2 + 56376^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-890958666217 is a prime.

It is not a weakly prime, because it can be changed into another prime (890958666817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445479333108 + 445479333109.

It is an arithmetic number, because the mean of its divisors is an integer number (445479333109).

Almost surely, 2^890958666217 is an apocalyptic number.

It is an amenable number.

890958666217 is a deficient number, since it is larger than the sum of its proper divisors (1).

890958666217 is an equidigital number, since it uses as much as digits as its factorization.

890958666217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78382080, while the sum is 67.

The spelling of 890958666217 in words is "eight hundred ninety billion, nine hundred fifty-eight million, six hundred sixty-six thousand, two hundred seventeen".