90518478509 has 8 divisors (see below), whose sum is σ = 90687155832. Its totient is φ = 90349862400.

The previous prime is 90518478503. The next prime is 90518478539. The reversal of 90518478509 is 90587481509.

It can be written as a sum of positive squares in 4 ways, for example, as 64145692900 + 26372785609 = 253270^2 + 162397^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90518478509 - 2¹⁶ = 90518412973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90518478503) 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 in 7 ways as a sum of consecutive naturals, for example, 3818357 + ... + 3841989.

It is an arithmetic number, because the mean of its divisors is an integer number (11335894479).

Almost surely, 2^90518478509 is an apocalyptic number.

It is an amenable number.

90518478509 is a deficient number, since it is larger than the sum of its proper divisors (168677323).

90518478509 is a wasteful number, since it uses less digits than its factorization.

90518478509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30607.

The product of its (nonzero) digits is 3628800, while the sum is 56.

The spelling of 90518478509 in words is "ninety billion, five hundred eighteen million, four hundred seventy-eight thousand, five hundred nine".