509681320763 has 4 divisors (see below), whose sum is σ = 509840152680. Its totient is φ = 509522488848.

The previous prime is 509681320739. The next prime is 509681320777. The reversal of 509681320763 is 367023186905.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 367023186905 = 5 ⋅73404637381.

It is a cyclic number.

It is not a de Polignac number, because 509681320763 - 2⁶ = 509681320699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (509681320783) 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, 79411145 + ... + 79417562.

It is an arithmetic number, because the mean of its divisors is an integer number (127460038170).

Almost surely, 2^509681320763 is an apocalyptic number.

509681320763 is a deficient number, since it is larger than the sum of its proper divisors (158831917).

509681320763 is a wasteful number, since it uses less digits than its factorization.

509681320763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158831916.

The product of its (nonzero) digits is 1632960, while the sum is 50.

It can be divided in two parts, 50968 and 1320763, that added together give a palindrome (1371731).

The spelling of 509681320763 in words is "five hundred nine billion, six hundred eighty-one million, three hundred twenty thousand, seven hundred sixty-three".