509638578945 has 32 divisors (see below), whose sum is σ = 817140290304. Its totient is φ = 271234656000.

The previous prime is 509638578941. The next prime is 509638578947. The reversal of 509638578945 is 549875836905.

It is not a de Polignac number, because 509638578945 - 2² = 509638578941 is a prime.

It is a super-2 number, since 2×509638578945² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 509638578945.

It is not an unprimeable number, because it can be changed into a prime (509638578941) 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, 51468495 + ... + 51478395.

It is an arithmetic number, because the mean of its divisors is an integer number (25535634072).

Almost surely, 2^509638578945 is an apocalyptic number.

It is an amenable number.

509638578945 is a deficient number, since it is larger than the sum of its proper divisors (307501711359).

509638578945 is a wasteful number, since it uses less digits than its factorization.

509638578945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16793.

The product of its (nonzero) digits is 326592000, while the sum is 69.

The spelling of 509638578945 in words is "five hundred nine billion, six hundred thirty-eight million, five hundred seventy-eight thousand, nine hundred forty-five".