90665786417 has 4 divisors (see below), whose sum is σ = 90666392436. Its totient is φ = 90665180400.

The previous prime is 90665786381. The next prime is 90665786437. The reversal of 90665786417 is 71468756609.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 17190094321 + 73475692096 = 131111^2 + 271064^2 .

It is a cyclic number.

It is not a de Polignac number, because 90665786417 - 2¹⁶ = 90665720881 is a prime.

It is a super-2 number, since 2×90665786417² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90665786437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100667 + ... + 437567.

It is an arithmetic number, because the mean of its divisors is an integer number (22666598109).

Almost surely, 2^90665786417 is an apocalyptic number.

It is an amenable number.

90665786417 is a deficient number, since it is larger than the sum of its proper divisors (606019).

90665786417 is a wasteful number, since it uses less digits than its factorization.

90665786417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606018.

The product of its (nonzero) digits is 15240960, while the sum is 59.

The spelling of 90665786417 in words is "ninety billion, six hundred sixty-five million, seven hundred eighty-six thousand, four hundred seventeen".