509951990585 has 4 divisors (see below), whose sum is σ = 611942388708. Its totient is φ = 407961592464.

The previous prime is 509951990557. The next prime is 509951990593. The reversal of 509951990585 is 585099159905.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 126449226409 + 383502764176 = 355597^2 + 619276^2 .

It is a cyclic number.

It is not a de Polignac number, because 509951990585 - 2²⁴ = 509935213369 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50995199054 + ... + 50995199063.

It is an arithmetic number, because the mean of its divisors is an integer number (152985597177).

Almost surely, 2^509951990585 is an apocalyptic number.

It is an amenable number.

509951990585 is a deficient number, since it is larger than the sum of its proper divisors (101990398123).

509951990585 is a wasteful number, since it uses less digits than its factorization.

509951990585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101990398122.

The product of its (nonzero) digits is 32805000, while the sum is 65.

The spelling of 509951990585 in words is "five hundred nine billion, nine hundred fifty-one million, nine hundred ninety thousand, five hundred eighty-five".