509505643798 has 4 divisors (see below), whose sum is σ = 764258465700. Its totient is φ = 254752821898.

The previous prime is 509505643783. The next prime is 509505643841. The reversal of 509505643798 is 897346505905.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127376410948 + ... + 127376410951.

It is an arithmetic number, because the mean of its divisors is an integer number (191064616425).

Almost surely, 2^509505643798 is an apocalyptic number.

509505643798 is a deficient number, since it is larger than the sum of its proper divisors (254752821902).

509505643798 is a wasteful number, since it uses less digits than its factorization.

509505643798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254752821901.

The product of its (nonzero) digits is 40824000, while the sum is 61.

The spelling of 509505643798 in words is "five hundred nine billion, five hundred five million, six hundred forty-three thousand, seven hundred ninety-eight".