638343423552 has 56 divisors (see below), whose sum is σ = 1689205460800. Its totient is φ = 212748996096.

The previous prime is 638343423527. The next prime is 638343423563. The reversal of 638343423552 is 255324343836.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1040349 + ... + 1535907.

Almost surely, 2^638343423552 is an apocalyptic number.

It is an amenable number.

638343423552 is an abundant number, since it is smaller than the sum of its proper divisors (1050862037248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638343423552 is a wasteful number, since it uses less digits than its factorization.

638343423552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502283 (or 502273 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 48.

The spelling of 638343423552 in words is "six hundred thirty-eight billion, three hundred forty-three million, four hundred twenty-three thousand, five hundred fifty-two".