509560655591 has 4 divisors (see below), whose sum is σ = 548757629112. Its totient is φ = 470363682072.

The previous prime is 509560655501. The next prime is 509560655603. The reversal of 509560655591 is 195556065905.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 195556065905 = 5 ⋅39111213181.

It is a cyclic number.

It is not a de Polignac number, because 509560655591 - 2¹⁴ = 509560639207 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 (509560655501) 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, 19598486741 + ... + 19598486766.

It is an arithmetic number, because the mean of its divisors is an integer number (137189407278).

Almost surely, 2^509560655591 is an apocalyptic number.

509560655591 is a deficient number, since it is larger than the sum of its proper divisors (39196973521).

509560655591 is a wasteful number, since it uses less digits than its factorization.

509560655591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39196973520.

The product of its (nonzero) digits is 9112500, while the sum is 56.

The spelling of 509560655591 in words is "five hundred nine billion, five hundred sixty million, six hundred fifty-five thousand, five hundred ninety-one".