509979751659811 has 4 divisors (see below), whose sum is σ = 510013362678192. Its totient is φ = 509946140641432.

The previous prime is 509979751659673. The next prime is 509979751659857. The reversal of 509979751659811 is 118956157979905.

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

It is a cyclic number.

It is not a de Polignac number, because 509979751659811 - 2⁹ = 509979751659299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (509979751659871) 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, 16805486431 + ... + 16805516776.

It is an arithmetic number, because the mean of its divisors is an integer number (127503340669548).

Almost surely, 2^{509979751659811} is an apocalyptic number.

509979751659811 is a deficient number, since it is larger than the sum of its proper divisors (33611018381).

509979751659811 is a wasteful number, since it uses less digits than its factorization.

509979751659811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33611018380.

The product of its (nonzero) digits is 1928934000, while the sum is 82.

The spelling of 509979751659811 in words is "five hundred nine trillion, nine hundred seventy-nine billion, seven hundred fifty-one million, six hundred fifty-nine thousand, eight hundred eleven".