90659695509 has 6 divisors (see below), whose sum is σ = 130952893526. Its totient is φ = 60439797000.

The previous prime is 90659695507. The next prime is 90659695547. The reversal of 90659695509 is 90559695609.

90659695509 is a `hidden beast` number, since 9 + 0 + 65 + 9 + 69 + 5 + 509 = 666.

It can be written as a sum of positive squares in only one way, i.e., 88914294225 + 1745401284 = 298185^2 + 41778^2 .

It is not a de Polignac number, because 90659695509 - 2¹ = 90659695507 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 (90659695507) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5036649742 + ... + 5036649759.

Almost surely, 2^90659695509 is an apocalyptic number.

It is an amenable number.

90659695509 is a deficient number, since it is larger than the sum of its proper divisors (40293198017).

90659695509 is a wasteful number, since it uses less digits than its factorization.

90659695509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10073299507 (or 10073299504 counting only the distinct ones).

The product of its (nonzero) digits is 29524500, while the sum is 63.

The spelling of 90659695509 in words is "ninety billion, six hundred fifty-nine million, six hundred ninety-five thousand, five hundred nine".