638065858835 has 8 divisors (see below), whose sum is σ = 768443216496. Its totient is φ = 508609896480.

The previous prime is 638065858831. The next prime is 638065858841. The reversal of 638065858835 is 538858560836.

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

It is not a de Polignac number, because 638065858835 - 2² = 638065858831 is a prime.

It is a super-2 number, since 2×638065858835² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638065858831) 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, 230347301 + ... + 230350070.

It is an arithmetic number, because the mean of its divisors is an integer number (96055402062).

Almost surely, 2^638065858835 is an apocalyptic number.

638065858835 is a deficient number, since it is larger than the sum of its proper divisors (130377357661).

638065858835 is a wasteful number, since it uses less digits than its factorization.

638065858835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460697653.

The product of its (nonzero) digits is 165888000, while the sum is 65.

The spelling of 638065858835 in words is "six hundred thirty-eight billion, sixty-five million, eight hundred fifty-eight thousand, eight hundred thirty-five".