90885545669 has 2 divisors, whose sum is σ = 90885545670. Its totient is φ = 90885545668.

The previous prime is 90885545593. The next prime is 90885545683. The reversal of 90885545669 is 96654558809.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80165428225 + 10720117444 = 283135^2 + 103538^2 .

It is a cyclic number.

It is not a de Polignac number, because 90885545669 - 2¹² = 90885541573 is a prime.

It is a super-4 number, since 4×90885545669⁴ (a number of 45 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90885545689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45442772834 + 45442772835.

It is an arithmetic number, because the mean of its divisors is an integer number (45442772835).

Almost surely, 2^90885545669 is an apocalyptic number.

It is an amenable number.

90885545669 is a deficient number, since it is larger than the sum of its proper divisors (1).

90885545669 is an equidigital number, since it uses as much as digits as its factorization.

90885545669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312000, while the sum is 65.

The spelling of 90885545669 in words is "ninety billion, eight hundred eighty-five million, five hundred forty-five thousand, six hundred sixty-nine".