90856936717 has 2 divisors, whose sum is σ = 90856936718. Its totient is φ = 90856936716.

The previous prime is 90856936691. The next prime is 90856936739. The reversal of 90856936717 is 71763965809.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57229079076 + 33627857641 = 239226^2 + 183379^2 .

It is a cyclic number.

It is not a de Polignac number, because 90856936717 - 2¹¹ = 90856934669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90856936757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45428468358 + 45428468359.

It is an arithmetic number, because the mean of its divisors is an integer number (45428468359).

Almost surely, 2^90856936717 is an apocalyptic number.

It is an amenable number.

90856936717 is a deficient number, since it is larger than the sum of its proper divisors (1).

90856936717 is an equidigital number, since it uses as much as digits as its factorization.

90856936717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17146080, while the sum is 61.

The spelling of 90856936717 in words is "ninety billion, eight hundred fifty-six million, nine hundred thirty-six thousand, seven hundred seventeen".