509949887647 has 2 divisors, whose sum is σ = 509949887648. Its totient is φ = 509949887646.

The previous prime is 509949887639. The next prime is 509949887669. The reversal of 509949887647 is 746788949905.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 509949887647 - 2³ = 509949887639 is a prime.

It is a super-2 number, since 2×509949887647² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (509949887347) by changing a digit.

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 as a sum of consecutive naturals, namely, 254974943823 + 254974943824.

It is an arithmetic number, because the mean of its divisors is an integer number (254974943824).

Almost surely, 2^509949887647 is an apocalyptic number.

509949887647 is a deficient number, since it is larger than the sum of its proper divisors (1).

509949887647 is an equidigital number, since it uses as much as digits as its factorization.

509949887647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1097349120, while the sum is 76.

The spelling of 509949887647 in words is "five hundred nine billion, nine hundred forty-nine million, eight hundred eighty-seven thousand, six hundred forty-seven".