638862001065 has 16 divisors (see below), whose sum is σ = 1135754668800. Its totient is φ = 340726400496.

The previous prime is 638862001061. The next prime is 638862001073. The reversal of 638862001065 is 560100268836.

638862001065 is a `hidden beast` number, since 6 + 3 + 8 + 8 + 620 + 0 + 10 + 6 + 5 = 666.

It is not a de Polignac number, because 638862001065 - 2² = 638862001061 is a prime.

It is a super-2 number, since 2×638862001065² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 638862001065.

It is not an unprimeable number, because it can be changed into a prime (638862001061) by changing a digit.

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, 2366155425 + ... + 2366155694.

It is an arithmetic number, because the mean of its divisors is an integer number (70984666800).

Almost surely, 2^638862001065 is an apocalyptic number.

It is an amenable number.

638862001065 is a deficient number, since it is larger than the sum of its proper divisors (496892667735).

638862001065 is a wasteful number, since it uses less digits than its factorization.

638862001065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4732311133 (or 4732311127 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 638862001065 in words is "six hundred thirty-eight billion, eight hundred sixty-two million, one thousand, sixty-five".