647065358836 has 12 divisors (see below), whose sum is σ = 1219469330212. Its totient is φ = 298645550208.

The previous prime is 647065358809. The next prime is 647065358957. The reversal of 647065358836 is 638853560746.

It can be written as a sum of positive squares in 2 ways, for example, as 201367587600 + 445697771236 = 448740^2 + 667606^2 .

It is a super-2 number, since 2×647065358836² (a number of 24 digits) contains 22 as substring.

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 in 3 ways as a sum of consecutive naturals, for example, 6221782245 + ... + 6221782348.

Almost surely, 2^647065358836 is an apocalyptic number.

It is an amenable number.

647065358836 is a deficient number, since it is larger than the sum of its proper divisors (572403971376).

647065358836 is a wasteful number, since it uses less digits than its factorization.

647065358836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12443564610 (or 12443564608 counting only the distinct ones).

The product of its (nonzero) digits is 87091200, while the sum is 61.

The spelling of 647065358836 in words is "six hundred forty-seven billion, sixty-five million, three hundred fifty-eight thousand, eight hundred thirty-six".