509490495778 has 64 divisors (see below), whose sum is σ = 902462238720. Its totient is φ = 213378422400.

The previous prime is 509490495751. The next prime is 509490495779. The reversal of 509490495778 is 877594094905.

It is a happy number.

It is a super-2 number, since 2×509490495778² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (509490495779) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1483501 + ... + 1794367.

It is an arithmetic number, because the mean of its divisors is an integer number (14100972480).

Almost surely, 2^509490495778 is an apocalyptic number.

509490495778 is a deficient number, since it is larger than the sum of its proper divisors (392971742942).

509490495778 is a wasteful number, since it uses less digits than its factorization.

509490495778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311023.

The product of its (nonzero) digits is 114307200, while the sum is 67.

The spelling of 509490495778 in words is "five hundred nine billion, four hundred ninety million, four hundred ninety-five thousand, seven hundred seventy-eight".