638856223763 has 4 divisors (see below), whose sum is σ = 672480235560. Its totient is φ = 605232211968.

The previous prime is 638856223613. The next prime is 638856223781. The reversal of 638856223763 is 367322658836.

638856223763 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 638856223763 - 2¹² = 638856219667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638856223063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16812005870 + ... + 16812005907.

It is an arithmetic number, because the mean of its divisors is an integer number (168120058890).

Almost surely, 2^638856223763 is an apocalyptic number.

638856223763 is a deficient number, since it is larger than the sum of its proper divisors (33624011797).

638856223763 is a wasteful number, since it uses less digits than its factorization.

638856223763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33624011796.

The product of its digits is 52254720, while the sum is 59.

The spelling of 638856223763 in words is "six hundred thirty-eight billion, eight hundred fifty-six million, two hundred twenty-three thousand, seven hundred sixty-three".