638611600247 has 8 divisors (see below), whose sum is σ = 649106482800. Its totient is φ = 628117551360.

The previous prime is 638611600243. The next prime is 638611600309. The reversal of 638611600247 is 742006116836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 638611600247 - 2² = 638611600243 is a prime.

It is a super-2 number, since 2×638611600247² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 638611600198 and 638611600207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638611600241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1442828 + ... + 1832750.

It is an arithmetic number, because the mean of its divisors is an integer number (81138310350).

Almost surely, 2^638611600247 is an apocalyptic number.

638611600247 is a deficient number, since it is larger than the sum of its proper divisors (10494882553).

638611600247 is a wasteful number, since it uses less digits than its factorization.

638611600247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416833.

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 638611600247 in words is "six hundred thirty-eight billion, six hundred eleven million, six hundred thousand, two hundred forty-seven".