638382217364 has 6 divisors (see below), whose sum is σ = 1117168880394. Its totient is φ = 319191108680.

The previous prime is 638382217351. The next prime is 638382217373. The reversal of 638382217364 is 463712283836.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 541136784400 + 97245432964 = 735620^2 + 311842^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79797777167 + ... + 79797777174.

It is an arithmetic number, because the mean of its divisors is an integer number (186194813399).

Almost surely, 2^638382217364 is an apocalyptic number.

It is an amenable number.

638382217364 is a deficient number, since it is larger than the sum of its proper divisors (478786663030).

638382217364 is a wasteful number, since it uses less digits than its factorization.

638382217364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159595554345 (or 159595554343 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 53.

The spelling of 638382217364 in words is "six hundred thirty-eight billion, three hundred eighty-two million, two hundred seventeen thousand, three hundred sixty-four".