638265003565 has 16 divisors (see below), whose sum is σ = 875349296640. Its totient is φ = 437660213760.

The previous prime is 638265003557. The next prime is 638265003569. The reversal of 638265003565 is 565300562836.

638265003565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 638265003565 - 2³ = 638265003557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638265003569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2840125 + ... + 3056605.

It is an arithmetic number, because the mean of its divisors is an integer number (54709331040).

Almost surely, 2^638265003565 is an apocalyptic number.

It is an amenable number.

638265003565 is a deficient number, since it is larger than the sum of its proper divisors (237084293075).

638265003565 is a wasteful number, since it uses less digits than its factorization.

638265003565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300732.

The product of its (nonzero) digits is 3888000, while the sum is 49.

The spelling of 638265003565 in words is "six hundred thirty-eight billion, two hundred sixty-five million, three thousand, five hundred sixty-five".