638655530272 has 48 divisors (see below), whose sum is σ = 1265369749560. Its totient is φ = 317293975552.

The previous prime is 638655530267. The next prime is 638655530329. The reversal of 638655530272 is 272035556836.

It can be written as a sum of positive squares in 4 ways, for example, as 506767439376 + 131888090896 = 711876^2 + 363164^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9560604 + ... + 9627172.

Almost surely, 2^638655530272 is an apocalyptic number.

It is an amenable number.

638655530272 is a deficient number, since it is larger than the sum of its proper divisors (626714219288).

638655530272 is a wasteful number, since it uses less digits than its factorization.

638655530272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68485 (or 68477 counting only the distinct ones).

The product of its (nonzero) digits is 9072000, while the sum is 52.

The spelling of 638655530272 in words is "six hundred thirty-eight billion, six hundred fifty-five million, five hundred thirty thousand, two hundred seventy-two".