638611600265 has 16 divisors (see below), whose sum is σ = 777447002640. Its totient is φ = 503524270080.

The previous prime is 638611600243. The next prime is 638611600309. The reversal of 638611600265 is 562006116836.

It can be written as a sum of positive squares in 8 ways, for example, as 3236813449 + 635374786816 = 56893^2 + 797104^2 .

It is not a de Polignac number, because 638611600265 - 2⁸ = 638611600009 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 2614910 + ... + 2848679.

It is an arithmetic number, because the mean of its divisors is an integer number (48590437665).

Almost surely, 2^638611600265 is an apocalyptic number.

It is an amenable number.

638611600265 is a deficient number, since it is larger than the sum of its proper divisors (138835402375).

638611600265 is a wasteful number, since it uses less digits than its factorization.

638611600265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5463932.

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 638611600265 in words is "six hundred thirty-eight billion, six hundred eleven million, six hundred thousand, two hundred sixty-five".